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A153954 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 7 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 4, 16, 56, 424, 2979, 43547, 596720, 16903736, 450129276, 24740929636, 1274646618498, 135794808093563, 13566737103811527, 2802238029568573488, 542899687293133798346, 217420519981066905114215 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Sequence in context: A235459 A081919 A232664 * A275764 A053349 A228626

Adjacent sequences:  A153951 A153952 A153953 * A153955 A153956 A153957

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified October 28 03:02 EDT 2021. Contains 348307 sequences. (Running on oeis4.)