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A154001
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 13 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 4, 16, 64, 508, 4054, 64383, 1024957, 32457661, 1032121857, 65351102113, 4153964152453, 525755086303623, 66797889955402370, 16898128960552112680, 4291148950249485286442, 2169726567052465643085463
OFFSET
0,2
CROSSREFS
Sequence in context: A153992 A153995 A153998 * A154004 A338364 A060656
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved