a(n) = 20*a(n-1) - a(n-2) with a(0) = 0, a(1) = 3.

A001084

a(n) = 20*a(n-1) - a(n-2) with a(0) = 0, a(1) = 3.

Terms

    a(0) =0a(1) =3a(2) =60a(3) =1197a(4) =23880a(5) =476403a(6) =9504180a(7) =189607197a(8) =3782639760a(9) =75463188003

External references