Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0001 pattern in any orientation.

A146660

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =73a(11) =73a(12) =521a(13) =521a(14) =7411a(15) =7411a(16) =207693a(17) =207693a(18) =7583663a(19) =7583663a(20) =399906057a(21) =399906057

External references