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Search: id:A153987
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A153987 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with every one adjacent to exactly 2 other ones. +0
1
1, 1, 2, 3, 5, 12, 33, 97, 381, 1490, 7757, 42774, 307960, 2294754, 22718581, 231171797, 3121763126, 43651298703, 807916379400, 15440457456928, 391605380566734, 10243338678890245, 355535039683009851 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A124370 A003428 A030041 this_sequence A008323 A000997 A107475

Adjacent sequences: A153984 A153985 A153986 this_sequence A153988 A153989 A153990

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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