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A153931
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 4 ones in any 3 X 3 X 3 subtriangle.
0
1, 2, 2, 3, 5, 9, 17, 59, 104, 345, 1199, 3851, 12806, 82134, 263587, 1652702, 10527130, 63679653, 393522264, 4714694321, 28217205768, 327320006475, 3884899169563, 43662102002059, 501940164730369, 11189482352958319, 124569478026604902
OFFSET
0,2
CROSSREFS
Sequence in context: A350432 A226956 A141602 * A214049 A273034 A374735
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved