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A146605 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 19, 59, 237, 1193, 6925, 46535, 385115, 3834729, 46129325, 665267927, 11525172145, 240724568637, 6036636466243, 182136263500283, 6609883325424453 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0

.0.0.0.0.1.0.0.0

.1.0.0.0.1.1.0.0

.1.1.1.1.0.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146429 A297390 A018316 * A147070 A130586 A147146

Adjacent sequences:  A146602 A146603 A146604 * A146606 A146607 A146608

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 14 09:43 EST 2019. Contains 329111 sequences. (Running on oeis4.)