A147450 - OEIS

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A147450

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 13, 27, 49, 163, 479, 1319, 4265, 14651, 50725, 219167, 1062605, 5322067, 29208507

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

LINKS

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

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.0.0.1.1.0

.1.0.0.0.0.0.1.1.0.0

.1.1.0.0.0.1.1.0.0.0

.0.1.1.0.1.1.0.0.0.0

.0.0.1.1.0.0.1.0.0.0

.0.0.0.1.0.0.1.1.0.0

.0.0.0.0.1.1.0.1.1.0

.0.0.0.1.1.0.0.0.1.1

.0.0.1.1.0.0.0.0.0.1

.0.1.1.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A189528 A132755 A250667 * A195045 A098266 A041332

Adjacent sequences: A147447 A147448 A147449 * A147451 A147452 A147453

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved