Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
A146878
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =9a(6) =41a(7) =249a(8) =1137a(9) =4177a(10) =27849a(11) =254297a(12) =2360945a(13) =31718257a(14) =561884345a(15) =12949529033a(16) =316511614977
External references
- oeis: A146878