G.f. satisfies: A(x) = 1 + Sum_{n>=1} x^n*A(x)^sigma(n), where sigma(n) = A000203(n) is the sum of divisors of n.
A192497
G.f. satisfies: A(x) = 1 + Sum_{n>=1} x^n*A(x)^sigma(n), where sigma(n) = A000203(n) is the sum of divisors of n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =73a(6) =281a(7) =1124a(8) =4633a(9) =19547a(10) =84023a(11) =366695a(12) =1620513a(13) =7237034a(14) =32609389a(15) =148066067a(16) =676805101a(17) =3111807931a(18) =14381741533a(19) =66775448718a(20) =311332294182
External references
- oeis: A192497