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A153942 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 5 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 4, 15, 38, 236, 1250, 13966, 128542, 2461620, 40144584, 1355506385, 38359079886, 2280018933124, 113583264552803, 11849601571255761, 1037356176207581620, 189822553366119038561 (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: A007122 A005219 A153945 * A055466 A342957 A148267

Adjacent sequences:  A153939 A153940 A153941 * A153943 A153944 A153945

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 18 14:46 EDT 2021. Contains 343089 sequences. (Running on oeis4.)