a(0)=1, a(1)=2, a(n) = sum_{k=0}^{k=n-1} 2^k a(k).
A015486
a(0)=1, a(1)=2, a(n) = sum_{k=0}^{k=n-1} 2^k a(k).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =25a(4) =225a(5) =3825a(6) =126225a(7) =8204625a(8) =1058396625a(9) =272007932625
External references
- oeis: A015486