Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0010 pattern in any orientation.
A146704
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =19a(8) =43a(9) =75a(10) =183a(11) =643a(12) =2215a(13) =9883a(14) =45633a(15) =225733a(16) =1239851a(17) =7715029a(18) =52987121a(19) =415234347a(20) =3530586371a(21) =34390495263
External references
- oeis: A146704