Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
A146908
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =3a(6) =5a(7) =21a(8) =49a(9) =187a(10) =409a(11) =2325a(12) =6489a(13) =55121a(14) =197983a(15) =2161765a(16) =11768363a(17) =152495079a(18) =1086067425a(19) =18675930957a(20) =164918184657
External references
- oeis: A146908