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A146400 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 51, 261, 1539, 11759, 111585, 1296125, 18399415, 335874781, 7824897067, 229077144211, 8419643660275, 387472393043501, 22360944601180667 (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

.0.0.0.0.1.0.0.0

.0.0.0.1.1.0.1.1

.0.0.1.0.1.0.1.0

.1.1.1.1.0.1.1.0

.1.0.0.0.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A070313 A146733 A146709 * A146408 A050894 A146464

Adjacent sequences:  A146397 A146398 A146399 * A146401 A146402 A146403

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 27 18:40 EDT 2021. Contains 348287 sequences. (Running on oeis4.)