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

A146937

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =6a(10) =9a(11) =14a(12) =23a(13) =61a(14) =135a(15) =392a(16) =922a(17) =2676a(18) =7151a(19) =26809a(20) =87678a(21) =375597a(22) =1374921a(23) =6569486a(24) =27726558a(25) =157145315a(26) =778948913a(27) =5094691047a(28) =28915328479a(29) =216796412908

External references