A147387 - OEIS

A147387

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10001-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 9, 20, 57, 190, 629, 2776, 15917, 99291, 695261, 5658010, 52047047, 554192227, 6986434456, 103110572004, 1764252322607, 34869976082784

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OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.0.0.0.0.0.1.0.0

.0.0.0.0.1.1.0.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.1.1.0

.1.1.1.1.1.0.0.0

.1.0.0.0.1.0.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147356 A147416 A078841 * A146267 A151420 A196294

Adjacent sequences: A147384 A147385 A147386 * A147388 A147389 A147390

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved