A146387 - OEIS

A146387

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation.

1, 1, 1, 1, 1, 4, 7, 18, 33, 62, 229, 826, 2874, 11455, 45319, 227245, 1250786, 7902554, 51293369, 381222454, 3041924174, 28668489843, 286940122325, 3336283386716

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OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.0.1.1.0.0.0

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.0.1.1.0.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A011948 A256216 A285462 * A219498 A358078 A219754

Adjacent sequences: A146384 A146385 A146386 * A146388 A146389 A146390

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved