Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0110 pattern in any orientation.

A146670

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0110 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =9a(9) =19a(10) =33a(11) =71a(12) =215a(13) =791a(14) =3245a(15) =13621a(16) =57411a(17) =277797a(18) =1527109a(19) =9994857a(20) =71286549a(21) =571498723

External references