The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A160646 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A160646

First differences of A160644.
(history; published version)

#7 by Russ Cox at Sat Mar 31 13:23:39 EDT 2012

AUTHOR

_Alford Arnold (Alford1940(AT)aol.com), _, May 24 2009

Discussion

Sat Mar 31

13:23

OEIS Server: https://oeis.org/edit/global/889

#6 by Nathaniel Johnston at Sat Apr 30 00:19:13 EDT 2011

STATUS

proposed

approved

#5 by Nathaniel Johnston at Sat Apr 30 00:19:10 EDT 2011

NAME

First differences of sequence A160644.

DATA

0, 1, 1, 1, 3, 3, 4, 8, 10, 13, 22, 28, 39, 58, 77, 104, 148, 197, 265, 363, 481, 638, 858, 1126, 1480, 1953, 2544, 3309, 4312, 5566, 7175, 9246, 11843, 15136, 19328, 24564, 31158, 39466, 49811, 62737, 78900, 98931, 123817, 154707, 192830, 239911, 298013

LINKS

Nathaniel Johnston, <a href="/A160646/b160646.txt">Table of n, a(n) for n = 1..2500</a>

EXAMPLE

A160644 begins 1 , 1 , 2 , 3 , 4 , 7 , 10 , 14 , 22 , 32 , 45 , 67 , 95 , 134 , 192 , ... so a(n) begins 0, 1, 1, 1, 3, 3, 4, 8, 10, 13, 22, 28, 39, 58, ...

so a(n) begins 0.1.1.1.3.3..4..8 10 13 22 28 39 .58 ...

STATUS

approved

proposed

#4 by T. D. Noe at Sun Feb 20 20:23:09 EST 2011

STATUS

proposed

approved

#3 by Omar E. Pol at Sun Feb 20 20:21:31 EST 2011

CROSSREFS

Cf. A000041 , A002685 , A053445 , A160644 , A160648.

#2 by Omar E. Pol at Sun Feb 20 20:20:03 EST 2011

NAME

First diferences differences of sequence A160644.

STATUS

approved

proposed

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

First diferences of sequence A160644.

DATA

0, 1, 1, 1, 3, 3, 4, 8, 10, 13, 22, 28, 39, 58

OFFSET

1,5

COMMENTS

Second differences count a subset of unrestricted partitions; cf. A160648.

EXAMPLE

A160644 begins 1 1 2 3 4 7 10 14 22 32 45 67 95 134 192 ...

so a(n) begins 0.1.1.1.3.3..4..8 10 13 22 28 39 .58 ...

CROSSREFS

A000041 A002685 A053445 A160644 A160648

KEYWORD

easy,nonn

AUTHOR

Alford Arnold (Alford1940(AT)aol.com), May 24 2009

STATUS

approved