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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.
0
20, 60, 123, 304, 180, 208, 509, 248, 136, 220, 132, 58, 42, 78
OFFSET
4,1
CROSSREFS
Sequence in context: A275167 A344200 A163761 * A078184 A362268 A116530
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved