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A146694 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 37, 103, 317, 831, 2581, 12105, 62053, 307133, 1586103, 9856867, 66841097, 477861431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.0.0.0.0

.1.0.0.1.1.0.0.0

.1.0.0.1.1.0.0.0

.1.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.1

.0.0.0.1.1.0.0.1

.0.0.0.1.1.0.0.1

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A014540 A293058 A294367 * A146050 A147500 A300445

Adjacent sequences:  A146691 A146692 A146693 * A146695 A146696 A146697

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 18 20:22 EDT 2019. Contains 327181 sequences. (Running on oeis4.)