The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A208804 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A208804

Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).
(history; published version)

#11 by Jon E. Schoenfield at Mon Mar 13 00:23:03 EDT 2017

STATUS

editing

approved

#10 by Jon E. Schoenfield at Mon Mar 13 00:22:56 EDT 2017

NAME

Number of n-bead necklaces labelled labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).

EXAMPLE

Some solutions for n=6:

STATUS

approved

editing

#9 by Charles R Greathouse IV at Thu Mar 02 18:17:12 EST 2017

STATUS

proposed

approved

#8 by Michel Marcus at Thu Mar 02 16:15:44 EST 2017

STATUS

editing

proposed

#7 by Michel Marcus at Thu Mar 02 16:15:40 EST 2017

COMMENTS

Column 7 of A208805

CROSSREFS

Column 7 of A208805.

AUTHOR

R. H. Hardin , Mar 01 2012

STATUS

proposed

editing

#6 by Andrew Howroyd at Thu Mar 02 15:15:47 EST 2017

STATUS

editing

proposed

#5 by Andrew Howroyd at Thu Mar 02 15:15:08 EST 2017

DATA

1, 5, 22, 201, 1827, 21227, 243678, 2951235, 37509753, 473996108, 6076893848, 80987915371, 1065626336007, 14153929259801, 193667696486438, 2610764121932745, 35428434842511617, 493224952143247713, 6763266087728449466, 93152055287986212052

LINKS

Andrew Howroyd, <a href="/A208804/b208804.txt">Table of n, a(n) for n = 1..40</a>

EXTENSIONS

a(12)-a(20) from Andrew Howroyd, Mar 02 2017

STATUS

approved

editing

#4 by Russ Cox at Sat Mar 31 12:37:24 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Mar 01 2012

Discussion

Sat Mar 31

12:37

OEIS Server: https://oeis.org/edit/global/875

#3 by Ron Hardin at Thu Mar 01 20:50:36 EST 2012

STATUS

editing

approved

#2 by Ron Hardin at Thu Mar 01 20:50:23 EST 2012

NAME

allocated for Ron HardinNumber of n-bead necklaces labelled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1)

DATA

1, 5, 22, 201, 1827, 21227, 243678, 2951235, 37509753, 473996108, 6076893848

OFFSET

1,2

COMMENTS

Column 7 of A208805

EXAMPLE

Some solutions for n=6

.-4...-5...-5...-5...-6...-7...-3...-5...-3...-5...-4...-5...-5...-5...-5...-3

.-1...-3....0....1...-2....3...-2...-3...-3...-3...-3....0...-2...-2....1...-2

.-3...-3...-2...-4....4...-3....0....2...-2....1...-3...-5....1...-3...-4....0

..7....2....6....0...-3....0...-3...-4....5....7....4....4...-4....5....5....5

..1....3....1....4....2....4....3....6...-1...-3....4....2....6....3....0...-1

..0....6....0....4....5....3....5....4....4....3....2....4....4....2....3....1

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Mar 01 2012

STATUS

approved

editing