A153906 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 5 X 5 X 5 subtriangle.

1, 2, 2, 3, 3, 4, 6, 11, 18, 31, 50, 107, 181, 433, 779, 1919, 3907, 10795, 25121, 75000, 190622, 625348, 1698419, 6161541, 18153209, 72093319, 233832256, 1013942489, 3627226950, 17175822290, 67626821845

Offset

0,2

Links

Table of n, a(n) for n=0..30.

Crossrefs

Sequence in context: A241152 A367843 A164529 * A067619 A236972 A184351

Adjacent sequences: A153903 A153904 A153905 * A153907 A153908 A153909

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved