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A154057
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 6.
0
10, 25, 36, 74, 46, 40, 70, 47, 49, 20, 13, 19, 17, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13
OFFSET
4,1
COMMENTS
Value 13 starts at n=17 and continues through at least n=60.
CROSSREFS
Sequence in context: A274046 A014090 A345651 * A074814 A002600 A087473
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved