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A153998
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 12 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 4, 16, 64, 499, 3953, 61786, 971846, 30167054, 945677765, 58569920903, 3661573089790, 452214656078450, 56362299453225220, 13875014401044838663, 3447151263100307142903, 1691594815727250621502922
OFFSET
0,2
CROSSREFS
Sequence in context: A138870 A153992 A153995 * A154001 A154004 A338364
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved