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A147030 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 31, 77, 387, 2257, 17627, 156913, 1449769, 17078273, 269362403, 5270658519, 128747962057, 3752690933565, 128409913359645, 5451255918471683 (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

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.0.0.1.1.1.0

.0.0.0.1.0.0.1.1

.0.0.0.1.0.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A067980 A164569 A007686 * A146259 A146174 A147134

Adjacent sequences:  A147027 A147028 A147029 * A147031 A147032 A147033

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 25 22:06 EST 2022. Contains 350572 sequences. (Running on oeis4.)