Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.

A146420

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =13a(6) =29a(7) =109a(8) =438a(9) =2055a(10) =12862a(11) =88991a(12) =791639a(13) =8191225a(14) =106776687a(15) =1583975637a(16) =29823226111a(17) =639792465701

External references