A153553 Number of planar n X n X n binary triangular grids with no more than 4 ones in any similarly oriented 3 X 3 X 3 subtriangle.

1, 2, 8, 57, 781, 20279, 989864, 91377864, 15933677137, 5246093512391, 3262374894683471, 3831614279502257675, 8499107956072261758908, 35605260751502551680547117, 281710507240517708494081629167

Offset

0,2

Links

Table of n, a(n) for n=0..14.

Crossrefs

Sequence in context: A369192 A385874 A153525 * A334617 A191481 A229529

Adjacent sequences: A153550 A153551 A153552 * A153554 A153555 A153556

Keyword

nonn

Author

R. H. Hardin, Jan 01 2009

Status

approved