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A146629 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 47, 215, 1109, 8005, 71755, 717641, 8603611, 133533027, 2609017895, 64328667073, 1958813665949, 72296633852443, 3294639375085767, 187627806470686453 (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

.0.0.1.0.1.0.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.1.0.1.0

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.0.1.0.1.0.0.1.1

.0.0.1.1.1.1.0.0

.0.0.0.1.0.1.0.0

CROSSREFS

Sequence in context: A212677 A146802 A147054 * A195965 A137182 A011927

Adjacent sequences:  A146626 A146627 A146628 * A146630 A146631 A146632

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 22 19:45 EST 2022. Contains 350504 sequences. (Running on oeis4.)