Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

A146905

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =3a(10) =5a(11) =9a(12) =13a(13) =21a(14) =41a(15) =107a(16) =243a(17) =717a(18) =1683a(19) =4947a(20) =13775a(21) =49539a(22) =165935a(23) =690319a(24) =2538097a(25) =11779735a(26) =49469745a(27) =268313075a(28) =1318481817a(29) =8182984957

External references