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Search: id:A153915
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A153915 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 4 X 4 X 4 subtriangle. +0
1
1, 2, 3, 6, 8, 23, 56, 204, 561, 2634, 9589, 57271, 263195, 2051213, 12518144, 126095265, 984855718, 12768865644, 128552370071, 2154052520419, 28007473176570, 606579298687089, 10205582308897812, 285438654888054564 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A072847 A095895 A051934 this_sequence A093705 A103964 A088329

Adjacent sequences: A153912 A153913 A153914 this_sequence A153916 A153917 A153918

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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