A147320 - OEIS

A147320

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 6, 1, 33, 9, 187, 25, 1110

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OFFSET

1,9

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

.1.0.0.0.1.0.0.0.1

.1.1.1.1.0.1.1.1.1

.1.0.0.0.1.0.0.0.1

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A241171 A051930 A347488 * A038255 A075501 A089504

Adjacent sequences: A147317 A147318 A147319 * A147321 A147322 A147323

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved