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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Value 13 starts at n=17 and continues through at least n=60.

LINKS

Table of n, a(n) for n=4..60.

CROSSREFS

Sequence in context: A225974 A274046 A014090 * A074814 A002600 A087473

Adjacent sequences:  A154054 A154055 A154056 * A154058 A154059 A154060

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified November 26 09:38 EST 2020. Contains 338639 sequences. (Running on oeis4.)