Number of 3 X n checkerboards (with at least one red square) in which the set of red squares is edge-connected.
A059021
Number of 3 X n checkerboards (with at least one red square) in which the set of red squares is edge-connected.
Terms
- a(0) =0a(1) =6a(2) =40a(3) =218a(4) =1126a(5) =5726a(6) =28992a(7) =146642a(8) =741556a(9) =3749816a(10) =18961450a(11) =95880894a(12) =484833212a(13) =2451616864a(14) =12396892316a(15) =62686360476a(16) =316981037374
External references
- oeis: A059021