A154072 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 9.

20, 60, 123, 304, 180, 208, 509, 248, 136, 220, 132, 58, 42, 78

Offset

4,1

Links

Table of n, a(n) for n=4..17.

Crossrefs

Sequence in context: A275167 A344200 A163761 * A078184 A362268 A116530

Adjacent sequences: A154069 A154070 A154071 * A154073 A154074 A154075

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved