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A153939
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 3 X 3 X 3 subtriangle.
0
1, 2, 4, 15, 59, 432, 3332, 48304, 732710, 20860338, 622243455, 34837075520, 2043323102439, 224967044124824, 25947204334949263, 5617471553259441802, 1274053481965034919451, 542391484462533633238628
OFFSET
0,2
CROSSREFS
Sequence in context: A280065 A188228 A243796 * A112281 A316661 A014517
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved