A141482 Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 1 one in any 2 X 2 subblock.

1, 2, 1, 11, 8, 269, 85, 16334, 5933, 4005785, 817280, 2758179839, 505375405, 6795928721858, 826573277157, 51247532773412135, 4982395765808506, 1302848440978689378895, 90454037365096154821

Offset

0,2

Links

R. H. Hardin, Aug 09 2008, Table of n, a(n) for n = 0..30

Crossrefs

Sequence in context: A303611 A356446 A141504 * A262144 A079795 A052037

Adjacent sequences: A141479 A141480 A141481 * A141483 A141484 A141485

Keyword

nonn

Author

R. H. Hardin, Aug 09 2008

Status

approved