Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0110 pattern in any orientation.

A146921

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0110 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =4a(9) =7a(10) =11a(11) =16a(12) =35a(13) =94a(14) =264a(15) =702a(16) =1734a(17) =4891a(18) =17066a(19) =67788a(20) =281343a(21) =1140052a(22) =4839734a(23) =23096235a(24) =127115296a(25) =766176694a(26) =4824195749a(27) =31420497455a(28) =220872571333

External references