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.

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

Links

Table of n, a(n) for n=0..21.

Crossrefs

Sequence in context: A141138 A077627 A228136 * A117862 A105024 A050871

Adjacent sequences: A153924 A153925 A153926 * A153928 A153929 A153930

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved