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A147455 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01111-11000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 9, 19, 53, 174, 577, 2638, 14887, 91688, 621981, 4953292, 45339549, 483440905, 6106017477, 89757755470, 1517774827657, 29582954137388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.0.1.1.1.1.0

.0.0.1.0.0.0.1.1

.0.0.1.0.0.0.0.0

.0.0.1.0.0.0.0.0

.0.1.1.1.0.0.0.0

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A147477 A146677 A077442 * A146429 A297390 A018316

Adjacent sequences:  A147452 A147453 A147454 * A147456 A147457 A147458

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 2 23:51 EDT 2022. Contains 357230 sequences. (Running on oeis4.)