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A153948
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 6 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 4, 16, 48, 338, 2112, 27873, 325940, 7927215, 173294023, 7887044079, 319688425834, 27098632121268, 2049789115719959, 323784392678130807, 45665932705751433387, 13440450508552654148691
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..17.
CROSSREFS
Sequence in context:
A350646
A165905
A104354
*
A284730
A255730
A363441
Adjacent sequences:
A153945
A153946
A153947
*
A153949
A153950
A153951
KEYWORD
nonn
AUTHOR
R. H. Hardin
Jan 03 2009
STATUS
approved
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Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)