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A146613 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 49, 235, 1289, 9339, 82787, 865777, 11018603, 179905507, 3665014053, 93285011401, 2967105675995, 116229643915377, 5631229452463433 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.1.1.0.1.0

.0.0.0.1.1.0.1.1

.0.1.1.0.1.0.1.1

.1.1.1.1.0.1.1.0

.1.0.0.0.1.0.0.0

.0.1.1.1.1.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146669 A146637 A146701 * A083012 A233329 A070313

Adjacent sequences:  A146610 A146611 A146612 * A146614 A146615 A146616

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 5 14:54 EDT 2022. Contains 355099 sequences. (Running on oeis4.)