Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

A146459

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =19a(8) =53a(9) =91a(10) =437a(11) =1171a(12) =6755a(13) =23673a(14) =190687a(15) =829933a(16) =7917835a(17) =43969469a(18) =541189453a(19) =3877768971a(20) =62027074701a(21) =569529515425

External references