Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
A146728
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =13a(7) =31a(8) =59a(9) =133a(10) =487a(11) =1853a(12) =8419a(13) =38423a(14) =183353a(15) =1033531a(16) =6717069a(17) =50468649a(18) =417543651a(19) =3765006993a(20) =38269269195a(21) =435116516817
External references
- oeis: A146728