A153556 Number of planar n X n X n binary triangular grids with no more than 2 ones in any similarly oriented 4 X 4 X 4 subtriangle.

1, 2, 7, 22, 56, 314, 2550, 24293, 250951, 3887949, 82407385, 2243004307, 76766225602, 3520427296494, 214433571928555, 17089012661741075, 1773800463147318841, 242243488411952546357

Offset

0,2

Links

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

Crossrefs

Sequence in context: A153536 A153564 A153527 * A323228 A348290 A099132

Adjacent sequences: A153553 A153554 A153555 * A153557 A153558 A153559

Keyword

nonn

Author

R. H. Hardin, Jan 01 2009

Status

approved