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A166206 Number of n X n X n triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 11. 1
1, 12, 4, 16, 357, 1880, 26443, 1765534, 25412877, 1480441810, 406769105056, 17832789481005 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

CROSSREFS

Sequence in context: A307164 A181829 A199693 * A040137 A092237 A081987

Adjacent sequences:  A166203 A166204 A166205 * A166207 A166208 A166209

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 09 2009

STATUS

approved

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)