Number of n X 1 0..4 arrays with no three equal values in a row horizontally or vertically, and new values 0..4 introduced in row major order.

A222919

Number of n X 1 0..4 arrays with no three equal values in a row horizontally or vertically, and new values 0..4 introduced in row major order.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =41a(5) =158a(6) =663a(7) =2944a(8) =13537a(9) =63551a(10) =301968a(11) =1444795a(12) =6940099a(13) =33411718a(14) =161058633a(15) =776930015a(16) =3749357128a(17) =18098055047a(18) =87370273487a(19) =421820387606

External references