Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-1001 pattern in any orientation.

A146929

Number of n X n binary arrays symmetric about both diagonal and antidiagonal 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) =1a(6) =1a(7) =1a(8) =1a(9) =2a(10) =4a(11) =7a(12) =11a(13) =16a(14) =28a(15) =59a(16) =128a(17) =309a(18) =746a(19) =1962a(20) =5226a(21) =15414a(22) =47005a(23) =157387a(24) =544191a(25) =2059429a(26) =7980929a(27) =34126004a(28) =149438343a(29) =727180335

External references