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Search: id:A153920
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A153920 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 3 X 3 X 3 subtriangle. +0
1
1, 2, 2, 3, 10, 14, 49, 308, 775, 3862, 41331, 169669, 1449423, 25795923, 176879439, 2569800487, 77632066170, 900486220900, 21773916434861, 1104958273021411, 21496112349545252, 875306630139701071, 74586189583189934357 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A032103 A091044 A079661 this_sequence A067579 A019143 A084650

Adjacent sequences: A153917 A153918 A153919 this_sequence A153921 A153922 A153923

KEYWORD

nonn

AUTHOR

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

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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