A153552 Number of planar n X n X n binary triangular grids with no more than 3 ones in any similarly oriented 3 X 3 X 3 subtriangle.

1, 2, 8, 42, 430, 7658, 225975, 11631356, 1030701814, 156452829412, 40873817468453, 18360567911334693, 14174054613503947291, 18811898207306698915955, 42921569361133279517141175

Offset

0,2

Links

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

Crossrefs

Sequence in context: A093461 A191994 A153524 * A295199 A191479 A197935

Adjacent sequences: A153549 A153550 A153551 * A153553 A153554 A153555

Keyword

nonn

Author

R. H. Hardin, Jan 01 2009

Status

approved