Expansion of Product_{k>=1} 1/(1 - sigma(k)*x^k), where sigma(k) is the sum of the divisors of k (A000203).

A316961

Expansion of Product_{k>=1} 1/(1 - sigma(k)*x^k), where sigma(k) is the sum of the divisors of k (A000203).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =8a(4) =24a(5) =42a(6) =118a(7) =208a(8) =524a(9) =961a(10) =2191a(11) =3994a(12) =9020a(13) =16142a(14) =34500a(15) =62814a(16) =130496a(17) =234474a(18) =478334a(19) =855982a(20) =1712012a(21) =3061230a(22) =6003546a(23) =10689178a(24) =20783796a(25) =36789875a(26) =70540531a(27) =124812892a(28) =237022708a(29) =417422168

External references