L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} 3*a(n*k)*x^(n*k)/k ).
A203267
L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} 3*a(n*k)*x^(n*k)/k ).
Terms
- a(0) =1a(1) =7a(2) =46a(3) =371a(4) =2611a(5) =22444a(6) =163010a(7) =1414763a(8) =10666423a(9) =92901977a(10) =700765693a(11) =6267591344a(12) =47400875250a(13) =421269688378
External references
- oeis: A203267