The On-Line Encyclopedia of Integer Sequences (OEIS)

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A199893

Number of -3..3 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative
(history; published version)

#5 by Russ Cox at Sat Mar 31 12:36:37 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Nov 11 2011

Discussion

Sat Mar 31

12:36

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

#4 by Ron Hardin at Fri Nov 11 20:47:19 EST 2011

STATUS

editing

approved

#3 by Ron Hardin at Fri Nov 11 20:47:16 EST 2011

LINKS

R. H. Hardin, <a href="/A199893/b199893.txt">Table of n, a(n) for n = 1..200</a>

#2 by Ron Hardin at Fri Nov 11 20:46:56 EST 2011

NAME

allocated for Ron HardinNumber of -3..3 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative

DATA

1, 7, 25, 111, 461, 2035, 8823, 39053, 172355, 767425, 3420017, 15311495, 68665323, 308805403, 1391091909, 6278869703, 28381760049, 128482271031, 582346682067, 2642616002605, 12004291295381, 54583533395613, 248409301882015

OFFSET

1,2

COMMENTS

Column 3 of A199898

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Nov 11 2011

STATUS

approved

editing

#1 by Ron Hardin at Fri Nov 11 20:44:37 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved