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A153917
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 1, 1, 2, 1, 4, 13, 18, 49, 140, 188, 406, 1769, 3341, 8622, 44447, 84993, 281707, 1724133, 3711938, 16716005, 125407513, 356014822, 1906068709, 17144172762, 59257809503, 359265884506, 3898069443043
OFFSET
0,2
CROSSREFS
Sequence in context: A057593 A117008 A337366 * A326407 A126127 A230324
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved