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A153958 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 7 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 6, 8, 14, 52, 78, 248, 909, 2324, 7268, 47501, 121021, 658137, 4239215, 19354790, 106079779, 1177208160, 5469153552, 52045617401, 594802267838, 4804258306801, 46214470259731, 931757866564437, 7539129948721736 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

CROSSREFS

Sequence in context: A255710 A329137 A239851 * A216214 A269298 A153964

Adjacent sequences:  A153955 A153956 A153957 * A153959 A153960 A153961

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 4 08:58 EDT 2020. Contains 333213 sequences. (Running on oeis4.)