Number of n X 4 binary arrays with all 1s connected, a path of 1s from left column to right column, and no 1 having more than two 1s adjacent.

A163725

Number of n X 4 binary arrays with all 1s connected, a path of 1s from left column to right column, and no 1 having more than two 1s adjacent.

Terms

    a(0) =1a(1) =16a(2) =108a(3) =531a(4) =2119a(5) =7338a(6) =23330a(7) =70369a(8) =204461a(9) =576824a(10) =1589880a(11) =4304373a(12) =11495305a(13) =30376964a(14) =79611466a(15) =207289163a(16) =536963245a(17) =1385313538a(18) =3562495802a(19) =9138021569a(20) =23392128783a(21) =59784414592a(22) =152598577140a(23) =389109027023a(24) =991382100235

External references