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A153927
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 4, 10, 16, 32, 84, 364, 1408, 7139, 31239, 217079, 1318253, 12282116, 97242555, 1151164326, 12499753964, 202416004411, 2931538091352, 63055463078232, 1202866099324497, 34468364489176178
OFFSET
0,2
CROSSREFS
Sequence in context: A141138 A077627 A228136 * A117862 A105024 A050871
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved