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.

1, 2, 4, 16, 64, 499, 3953, 61786, 971846, 30167054, 945677765, 58569920903, 3661573089790, 452214656078450, 56362299453225220, 13875014401044838663, 3447151263100307142903, 1691594815727250621502922

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Crossrefs

Sequence in context: A138870 A153992 A153995 * A154001 A154004 A338364

Adjacent sequences: A153995 A153996 A153997 * A153999 A154000 A154001

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved