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A146591 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 67, 67, 353, 353, 1577, 1577, 17635 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.1.0.1.0.0.0.1.0.1.0.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.0.1.0.1.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A246035 A147340 A147499 * A146868 A147430 A147462

Adjacent sequences:  A146588 A146589 A146590 * A146592 A146593 A146594

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 17 11:02 EST 2019. Contains 329226 sequences. (Running on oeis4.)