a(n) = 1*6^n + 2*5^n + 3*4^n + 4*3^n + 5*2^n + 6*1^n.

A254144

a(n) = 1*6^n + 2*5^n + 3*4^n + 4*3^n + 5*2^n + 6*1^n.

Terms

    a(0) =21a(1) =56a(2) =196a(3) =812a(4) =3724a(5) =18236a(6) =93436a(7) =494732a(8) =2685004a(9) =14851676a(10) =83384476a(11) =473755052a(12) =2717541484a(13) =15709845116a(14) =91395715516a(15) =534498925772

External references