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A153525
Number of planar n X n X n binary triangular grids with no more than 4 ones in any 3 X 3 X 3 subtriangle.
0
1, 2, 8, 57, 775, 19641, 921690, 80625050, 13124722225, 3973078785189, 2237747461311054, 2344793549245488048, 4570701601942028573011, 16575255948705837833863791, 111824026459437969673639006613
OFFSET
0,2
CROSSREFS
Sequence in context: A133686 A369193 A369192 * A153553 A334617 A191481
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2009
STATUS
approved