Number of length 5+4 0..n arrays with some pair in every consecutive five terms totalling exactly n.

A246897

Number of length 5+4 0..n arrays with some pair in every consecutive five terms totalling exactly n.

Terms

    a(0) =416a(1) =16621a(2) =173056a(3) =1216081a(4) =4971120a(5) =17677453a(6) =47799488a(7) =120392449a(8) =259777600a(9) =536775181a(10) =1005318336a(11) =1828277521a(12) =3107102096a(13) =5168689261a(14) =8183025280a(15) =12745702273a(16) =19117702368a(17) =28308317869a(18) =40691100800a(19) =57882676561a(20) =80386887856

External references