A147371 - OEIS

A147371

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0111-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 3, 9, 19, 42, 149, 642, 3217, 16918, 103595, 764774, 6743975, 68369223, 809162389, 11357687762, 186710566988, 3547308633892, 78610913689329, 2049663760103557, 62999437730030008

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OFFSET

1,6

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.1.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.1.1.1.0

.0.1.0.1.0.0.0.0

.0.1.1.1.0.0.0.0

.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A373309 A153084 A285927 * A075188 A051894 A146393

Adjacent sequences: A147368 A147369 A147370 * A147372 A147373 A147374

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved