A146403 - OEIS

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A146403

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 19, 47, 85, 259, 857, 3329, 13923, 76419, 375879, 2500865, 15196877, 126783213, 979497309, 10344645479, 100578970271

(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

.1.1.0.0.0.0.0.1

.0.1.0.0.1.1.1.1

.0.1.1.0.0.1.0.0

.0.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.1.0.0.1.1.0

.1.1.1.1.0.0.1.0

.1.0.0.0.0.0.1.1

CROSSREFS

Sequence in context: A143128 A238730 A139865 * A000491 A097039 A067651

Adjacent sequences: A146400 A146401 A146402 * A146404 A146405 A146406

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved