Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

A146369

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =13a(10) =21a(11) =39a(12) =135a(13) =491a(14) =1711a(15) =5531a(16) =18851a(17) =87961a(18) =493635a(19) =2869867a(20) =17154745a(21) =107225849a(22) =792577759a(23) =6869876861a(24) =66058401395a(25) =676488427499

External references