Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.
A146837
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =15a(8) =37a(9) =79a(10) =151a(11) =497a(12) =1751a(13) =6209a(14) =28231a(15) =127833a(16) =673629a(17) =3604831a(18) =23345419a(19) =158561859a(20) =1232306475
External references
- oeis: A146837