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A153957 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 5 X 5 X 5 subtriangle. 0
1, 2, 4, 16, 56, 256, 1518, 15896, 171565, 3217779, 58858443, 1927799742, 63170771231, 3671078892600, 213376157401433, 21677971544137049 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

CROSSREFS

Sequence in context: A005388 A053503 A308381 * A068789 A009624 A009161

Adjacent sequences:  A153954 A153955 A153956 * A153958 A153959 A153960

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified May 18 05:16 EDT 2021. Contains 343994 sequences. (Running on oeis4.)