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A146133 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation. 0
1, 1, 1, 1, 1, 3, 17, 33, 85, 255, 1137, 4265, 27311, 122911, 972783, 6003645, 62308027, 499428829, 6712583897, 70003989585, 1225387976695, 16725199996985 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.0.0

.0.0.0.0.1.1.0.0

.0.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.0

.0.0.1.1.0.0.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A309744 A115355 A146021 * A297735 A266062 A031290

Adjacent sequences:  A146130 A146131 A146132 * A146134 A146135 A146136

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified January 26 03:23 EST 2022. Contains 350572 sequences. (Running on oeis4.)