Number of 4 X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

A208380

Number of 4 X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Terms

    a(0) =8a(1) =64a(2) =108a(3) =420a(4) =1344a(5) =4212a(6) =13860a(7) =44880a(8) =144540a(9) =468852a(10) =1517184a(11) =4906980a(12) =15883764a(13) =51401040a(14) =166325292a(15) =538259268a(16) =1741843392a(17) =5636673684a(18) =18240740100a(19) =59028275280a(20) =191019298428a(21) =618151779156

External references