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Search: id:A153923
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A153923 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 4 X 4 X 4 subtriangle. +0
1
1, 2, 723, 3847, 12686, 64066, 522788, 2375205, 17429033, 207659953, 1416380562, 15388271829, 267002004687, 2673537774503, 42803194029689, 1082510269366192 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A028367 A000197 A036298 this_sequence A167440 A156008 A103169

Adjacent sequences: A153920 A153921 A153922 this_sequence A153924 A153925 A153926

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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