A147434 - OEIS

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A147434

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 17, 31, 51, 113, 291, 823, 2647, 8411, 31311, 121645, 537901, 2460285, 12092291, 63560047, 371846157, 2296989649

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

OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.1.0.0.0.1.1

.1.1.1.1.0.1.1.0

.0.1.0.1.0.0.1.1

.0.0.0.0.0.1.1.0

.0.1.1.0.0.0.0.0

.1.1.0.0.1.0.1.0

.0.1.1.0.1.1.1.1

.1.1.0.0.0.1.0.1

CROSSREFS

Sequence in context: A143798 A031013 A031370 * A147336 A128354 A078654

Adjacent sequences: A147431 A147432 A147433 * A147435 A147436 A147437

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved