Number of n element 0..3 arrays with each element the minimum of 4 adjacent elements of a random 0..3 array of n+3 elements.

A217950

Number of n element 0..3 arrays with each element the minimum of 4 adjacent elements of a random 0..3 array of n+3 elements.

Terms

    a(0) =4a(1) =16a(2) =50a(3) =130a(4) =296a(5) =624a(6) =1289a(7) =2741a(8) =6134a(9) =14269a(10) =33577a(11) =78304a(12) =179671a(13) =406765a(14) =915275a(15) =2061311a(16) =4664237a(17) =10605587a(18) =24181837a(19) =55152622a(20) =125626530a(21) =285683099a(22) =648937238a(23) =1473615534a(24) =3347303199a(25) =7607369029a(26) =17296530794a(27) =39333312344

External references