A146375 - OEIS

A146375

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 21, 9, 201, 25, 1634, 125, 22896, 1331, 494897, 18779, 18283376, 389231, 1000392247, 11969301, 84124514832, 573650431, 10424120801341, 41782304071, 1874244968782308, 4475707668912

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OFFSET

1,9

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 9 X 9 example

.0.1.0.0.1.0.0.1.0

.1.1.1.0.1.0.1.1.1

.0.1.0.1.1.1.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.0.0.0.0.0.0.0