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A146672 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 19, 43, 71, 159, 607, 2057, 8951, 43111, 227107, 1266527, 7483327, 50232185, 389882233, 3353662007 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.0.1.1.1.0.0

.1.1.1.0.1.1.0.0

.0.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.0

.0.0.1.1.0.1.1.1

.0.0.1.1.1.0.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A336792 A341087 A031393 * A146704 A103145 A100694

Adjacent sequences:  A146669 A146670 A146671 * A146673 A146674 A146675

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 05:36 EDT 2021. Contains 348160 sequences. (Running on oeis4.)