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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
CROSSREFS
Sequence in context: A081919 A362524 A232664 * A275764 A053349 A228626
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved

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Last modified June 21 05:50 EDT 2024. Contains 373540 sequences. (Running on oeis4.)