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A153951 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 5 X 5 X 5 subtriangle. 0
1, 2, 4, 16, 48, 181, 930, 8275, 75027, 1115868, 15698357, 385413794, 9296853593, 385316885091, 15604629751554, 1064622004776402 (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: A034917 A215724 A003433 * A248748 A165905 A104354

Adjacent sequences:  A153948 A153949 A153950 * A153952 A153953 A153954

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified May 31 02:51 EDT 2020. Contains 334747 sequences. (Running on oeis4.)