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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 (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: A248748 A165905 A104354 * A284730 A255730 A010362

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 October 26 05:15 EDT 2020. Contains 338027 sequences. (Running on oeis4.)