Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation.
A146696
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =15a(8) =39a(9) =69a(10) =161a(11) =595a(12) =1935a(13) =6509a(14) =28979a(15) =154855a(16) =881531a(17) =5028621a(18) =31192755a(19) =226496585a(20) =1775509113
External references
- oeis: A146696