Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a one by five or five by one block.

A145971

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a one by five or five by one block.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =9a(5) =9a(6) =54a(7) =93a(8) =747a(9) =1903a(10) =18738a(11) =80363a(12) =1083847a(13) =6706491a(14) =120203159a(15) =1028058854

External references