Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.

A146932

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =9a(7) =21a(8) =65a(9) =198a(10) =664a(11) =2279a(12) =9527a(13) =44776a(14) =245082a(15) =1574117a(16) =10939250a(17) =91288331a(18) =843940046

External references