a(n) = 40*a(n - 1) - a(n - 2) for n>1, a(0) = 1, a(1) = 1.

A269028

a(n) = 40*a(n - 1) - a(n - 2) for n>1, a(0) = 1, a(1) = 1.

Terms

    a(0) =1a(1) =1a(2) =39a(3) =1559a(4) =62321a(5) =2491281a(6) =99588919a(7) =3981065479a(8) =159143030241

External references