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A146704 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 19, 43, 75, 183, 643, 2215, 9883, 45633, 225733, 1239851, 7715029, 52987121, 415234347, 3530586371, 34390495263 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.0.0.1.1.1.1

.0.1.1.0.1.1.0.0

.0.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.0

.0.0.1.1.0.1.1.0

.1.1.1.1.0.0.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A341087 A031393 A146672 * A103145 A100694 A146664

Adjacent sequences:  A146701 A146702 A146703 * A146705 A146706 A146707

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 25 12:38 EDT 2021. Contains 347654 sequences. (Running on oeis4.)