A154039 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 4.

126, 503, 1046, 1389, 1898, 1290, 897, 912, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900

Offset

3,1

Comments

Pattern 621 621 900 starts at n=11 and continues through at least n=57.

Links

Table of n, a(n) for n=3..55.

Example

Maximal zeros solution for n=11
............0
...........0.0
..........0.2.2
.........2.0.0.0
........0.0.2.0.0
.......0.2.0.0.2.2
......2.0.0.2.0.0.0
.....0.0.2.0.0.2.0.0
....0.2.0.0.2.0.0.2.2
...2.0.0.2.0.0.2.0.0.0
..0.0.2.0.0.2.0.0.2.0.0

Crossrefs

Sequence in context: A222341 A241270 A135192 * A202601 A202594 A245992

Adjacent sequences: A154036 A154037 A154038 * A154040 A154041 A154042

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved