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A146656 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 15, 35, 63, 141, 389, 1325, 3883, 15377, 77717, 402273, 2247249, 12314001, 75093365, 525963699 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.1.0.1

.0.1.0.0.0.1.1.1

.1.1.1.1.0.1.0.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0

.0.0.1.0.1.1.1.1

.1.1.1.0.0.0.1.0

.1.0.1.0.0.0.1.1

CROSSREFS

Sequence in context: A067930 A257836 A146688 * A229108 A160497 A098271

Adjacent sequences:  A146653 A146654 A146655 * A146657 A146658 A146659

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 24 18:55 EDT 2022. Contains 356949 sequences. (Running on oeis4.)