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A146709 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 51, 237, 1129, 8811, 85099, 859569, 10699439, 171553261, 3455226259, 90780787231, 2937046608631, 113622292506777, 5452353589454277, 328302441188610241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.0.0

.0.0.1.1.1.1.0.0

.1.1.0.1.0.0.1.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.1.0.0.1.0.1.1

.0.0.1.1.1.1.0.0

.0.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A233329 A070313 A146733 * A146400 A146408 A050894

Adjacent sequences:  A146706 A146707 A146708 * A146710 A146711 A146712

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 26 13:34 EDT 2021. Contains 347668 sequences. (Running on oeis4.)