A147352 - OEIS

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A147352

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01010-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 9, 13, 35, 115, 509, 1869, 11373, 63633, 550775, 4084072, 49640647, 508023623, 8372503581

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.0.1.0

.1.1.0.1.1.1.1.1

.0.1.1.0.0.1.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.1.0.0.1.1.0

.1.1.1.1.1.0.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A146739 A146723 A146422 * A147391 A241677 A146225

Adjacent sequences: A147349 A147350 A147351 * A147353 A147354 A147355

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved