A147470 - OEIS

A147470

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 3, 5, 9, 19, 55, 245, 1021, 4107, 20679, 138093, 1077295, 9543083, 95957809, 1121795793, 15620825665, 256368054863, 4898555273539, 109719649027999, 2878513446258779, 87946594793312351

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.1.1.1.1.0.0.1.0

.0.0.1.1.0.0.1.0

.0.1.0.0.1.1.0.0

.0.1.0.0.1.1.1.1

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A227234 A192480 A107028 * A147010 A146912 A146940

Adjacent sequences: A147467 A147468 A147469 * A147471 A147472 A147473

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved