A147342 - OEIS

A147342

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 31, 71

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OFFSET

1,10

LINKS

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

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.1.0.0.0.0

.0.0.0.0.0.1.1.1.0.0

.0.0.0.1.1.1.0.0.1.0

.0.0.1.0.0.1.0.0.1.0

.0.0.1.0.0.0.1.1.1.1

.1.1.1.1.0.0.0.1.0.0

.0.1.0.0.1.0.0.1.0.0

.0.1.0.0.1.1.1.0.0.0

.0.0.1.1.1.0.0.0.0.0

.0.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A004136 A335865 A147409 * A172310 A357370 A060939

Adjacent sequences: A147339 A147340 A147341 * A147343 A147344 A147345

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved