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A153912 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 3 X 3 X 3 subtriangle. 0
1, 2, 28586, 195384, 2093119, 20428045, 317866834, 4492197059, 100898111116, 2073132268053, 67489432729042, 2005814360075163, 94662265499676795, 4075394325398277635, 278524123602639198495, 17377022786797473216927 (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: A131558 A133857 A232869 * A247790 A233460 A047076

Adjacent sequences:  A153909 A153910 A153911 * A153913 A153914 A153915

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified October 31 00:18 EDT 2014. Contains 248844 sequences.