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Search: id:A153897
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A153897 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 2 X 2 X 2 subtriangle. +0
1
1, 2, 2, 6, 10, 38, 84, 462, 1454, 10978, 47966, 507832, 3102956, 45765610, 389928206, 8030198134, 95507073248, 2744133148026, 45539464036516, 1826082647001502, 42290971759195390, 2366417546297792380, 76478152220819322380 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A078008 A151575 A076907 this_sequence A103774 A036052 A091764

Adjacent sequences: A153894 A153895 A153896 this_sequence A153898 A153899 A153900

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 03 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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