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Search: id:A153930
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A153930 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 3 X 3 X 3 subtriangle. +0
1
1, 2, 4, 13, 45, 293, 1880, 22810, 274047, 6160861, 137419960, 5755708030, 238764714329, 18607726818765, 1436358552064865, 208215628095796834, 29898827223053355535, 8063377147636346175953, 2154023814255202610544411 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A001548 A115600 A007858 this_sequence A005164 A058134 A069730

Adjacent sequences: A153927 A153928 A153929 this_sequence A153931 A153932 A153933

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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