Expansion of e.g.f. exp(Sum_{k>=1} phi(k)^2 * x^k/k), where phi is the Euler totient function A000010.
A377507
Expansion of e.g.f. exp(Sum_{k>=1} phi(k)^2 * x^k/k), where phi is the Euler totient function A000010.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =66a(5) =690a(6) =4860a(7) =63000a(8) =711900a(9) =8876700a(10) =131405400a(11) =2160219600a(12) =37553808600a(13) =686750664600
External references
- oeis: A377507