A147379 - OEIS

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A147379

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 7, 15, 33, 101, 381, 1709, 8457, 46629, 303839, 2310935, 20572541, 212895819, 2545278493, 35199007061

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0

.0.1.1.0.0.1.1.1

.0.0.1.0.0.0.0.1

.0.0.1.1.0.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A351660 A199882 A147102 * A213722 A325924 A217092

Adjacent sequences: A147376 A147377 A147378 * A147380 A147381 A147382

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved