A147241 - OEIS

A147241

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 413, 413, 5775, 5775, 129385, 129385, 3828429, 3828429, 165279073, 165279073

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OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.0.1.0.1.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.1.0.1.0.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146785 A146572 A147211 * A146580 A146455 A146048

Adjacent sequences: A147238 A147239 A147240 * A147242 A147243 A147244

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved