Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1001-1111 pattern in any orientation.
A147137
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =13a(8) =33a(9) =61a(10) =123a(11) =351a(12) =1083a(13) =3363a(14) =12745a(15) =54981a(16) =257267a(17) =1349181a(18) =7264663a(19) =42437683a(20) =269731743
External references
- oeis: A147137