A147055 - OEIS

A147055

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 55, 157, 613, 2645, 10617, 38367, 155201, 818161, 5194409, 36087637, 257389985

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OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

.0.1.0.1.0.0.1.1

.1.1.1.0.0.0.0.1

.1.0.0.0.0.1.1.1

.1.1.0.0.1.0.1.0

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A058331 A328950 A049749 * A146638 A147135 A146843

Adjacent sequences: A147052 A147053 A147054 * A147056 A147057 A147058

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved