Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.

A147245

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =17a(8) =43a(9) =77a(10) =187a(11) =693a(12) =2641a(13) =10331a(14) =50859a(15) =230621a(16) =1381217a(17) =7944835a(18) =57500635a(19) =415589871a(20) =3698671025

External references