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A146129 Number of n X n binary arrays symmetric under horizontal and vertical reflection 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, 1, 1, 1, 29, 29, 249, 249, 3031, 3031, 82773, 82773, 3652185, 3652185, 277821789, 277821789, 35279858253, 35279858253, 7589314375275, 7589314375275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 9 X 9 example

.0.1.0.1.0.1.0.1.0

.1.1.0.1.0.1.0.1.1

.1.0.1.1.0.1.1.0.1

.1.0.1.0.0.0.1.0.1

.0.0.0.0.0.0.0.0.0

.1.0.1.0.0.0.1.0.1

.1.0.1.1.0.1.1.0.1

.1.1.0.1.0.1.0.1.1

.0.1.0.1.0.1.0.1.0

CROSSREFS

Sequence in context: A022363 A146226 A146423 * A146040 A146017 A210267

Adjacent sequences:  A146126 A146127 A146128 * A146130 A146131 A146132

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified October 22 19:03 EDT 2020. Contains 337953 sequences. (Running on oeis4.)