A147366 - OEIS

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A147366

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 4, 7, 18, 27, 60, 127, 520, 1313, 5577, 14738, 65753, 214371, 1292619, 5259696, 36901354, 169889413, 1338225681, 7299428688

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

OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.1.1.0

.1.1.0.1.1.1.1.1

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.1.1.1.1.1.0.1.1

.0.1.1.1.0.0.1.0

CROSSREFS

Sequence in context: A357041 A318025 A005509 * A056318 A011948 A256216

Adjacent sequences: A147363 A147364 A147365 * A147367 A147368 A147369

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved