A146603 - OEIS

A146603

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 177, 325, 3375, 7559, 107583, 279679, 10392307, 32537343, 2182245881, 8257920539, 997413109357, 4566791847617, 859237621422427, 4726361744374801, 1501159569808633603, 9908601381191408811

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OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A147429 A147461 A146366 * A159003 A352004 A196509

Adjacent sequences: A146600 A146601 A146602 * A146604 A146605 A146606

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved