The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A091468

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A091468

Number of unlabeled alternating octupi with n black nodes and n white nodes.
(history; published version)

#4 by Charles R Greathouse IV at Wed Apr 30 01:31:15 EDT 2014

FORMULA

3*A003239(n) - 2 (conjectured). - _Ralf Stephan, _, Feb 06 2004

Discussion

Wed Apr 30

01:31

OEIS Server: https://oeis.org/edit/global/2173

#3 by Russ Cox at Fri Mar 30 17:37:13 EDT 2012

AUTHOR

_Christian G. Bower (bowerc(AT)usa.net), _, Jan 12 2004

Discussion

Fri Mar 30

17:37

OEIS Server: https://oeis.org/edit/global/178

#2 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

Unlabeled Number of unlabeled alternating octupi with n black nodes and n white nodes.

KEYWORD

nonn,new

nonn

#1 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004

NAME

Unlabeled alternating octupi with n black nodes and n white nodes.

DATA

1, 4, 10, 28, 76, 238, 736, 2428, 8110, 27754, 96196, 338158, 1200070, 4298578, 15511810, 56352508, 205906432, 756265486, 2790415564, 10338503578, 38446991530, 143461341082, 536962873540, 2015475400942, 7584636386326

OFFSET

1,2

FORMULA

3*A003239(n) - 2 (conjectured). - Ralf Stephan, Feb 06 2004

CROSSREFS

Main diagonal of A091467.

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jan 12 2004

STATUS

approved