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A153927 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 4, 10, 16, 32, 84, 364, 1408, 7139, 31239, 217079, 1318253, 12282116, 97242555, 1151164326, 12499753964, 202416004411, 2931538091352, 63055463078232, 1202866099324497, 34468364489176178 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A141138 A077627 A228136 * A117862 A105024 A050871

Adjacent sequences:  A153924 A153925 A153926 * A153928 A153929 A153930

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified March 28 13:21 EDT 2020. Contains 333089 sequences. (Running on oeis4.)