A147408 - OEIS

A147408

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 25, 49, 175, 865, 4191, 18461, 94551, 650857, 5436423, 49032533, 472638523, 5306220921, 72329183333, 1150334935553, 20498079126697, 410408073960755

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OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.0.1

.0.0.0.0.1.1.1.1

.0.1.1.1.0.0.0.0

.0.0.0.1.0.0.0.0

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A272705 A147272 A147427 * A241657 A249513 A147090

Adjacent sequences: A147405 A147406 A147407 * A147409 A147410 A147411

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved