Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.

A207704

Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =102a(3) =289a(4) =1071a(5) =3969a(6) =13230a(7) =44100a(8) =153090a(9) =531441a(10) =1815939a(11) =6205081a(12) =21332924a(13) =73342096a(14) =251550372a(15) =862773129a(16) =2961885201a(17) =10168100569a(18) =34894442176a(19) =119749218304a(20) =411007092416

External references