G.f. A(x) satisfies: x = Sum_{n>=1} x^n*A(-x)^sigma(n), where sigma(n) = sum of divisors of n (A000203).
A193038
G.f. A(x) satisfies: x = Sum_{n>=1} x^n*A(-x)^sigma(n), where sigma(n) = sum of divisors of n (A000203).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =101a(6) =475a(7) =2321a(8) =11629a(9) =59364a(10) =307648a(11) =1614724a(12) =8567810a(13) =45890927a(14) =247817187a(15) =1347819147a(16) =7376472346a(17) =40594360200a(18) =224500075274
External references
- oeis: A193038