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A153966 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 9 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 4, 16, 63, 503, 3962, 62593, 985280, 31115163, 978497307, 61716861576, 3876240278447, 488304618912659, 61253301741519286, 15411314829496575043, 3861105314015021746287, 1940237622907994251667429 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A339648 A005027 A153969 * A138867 A138868 A138871
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved

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Last modified March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)