A146262 - OEIS

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A146262

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 33, 57, 93, 311, 1101, 3499, 17317, 84175, 569419, 2944127, 17772493, 117896615, 988499111, 8301329001, 91569781875

(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

.0.0.0.0.1.0.1.0

.1.1.0.0.1.1.1.0

.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.1

.0.0.1.1.0.1.1.0

.0.1.1.1.0.0.1.1

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A337234 A075812 A256868 * A161430 A175369 A046895

Adjacent sequences: A146259 A146260 A146261 * A146263 A146264 A146265

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved