L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} a(n*k)*x^(n*k)/k ).
A203253
L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} a(n*k)*x^(n*k)/k ).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =23a(4) =51a(5) =195a(6) =435a(7) =1631a(8) =4165a(9) =14563a(10) =34761a(11) =141479a(12) =327471a(13) =1222287a(14) =3267177a(15) =11804959a(16) =28562075a(17) =114349947a(18) =272702593a(19) =1056583023a(20) =2786781123a(21) =9966908779a(22) =24678676437a(23) =101422669199a(24) =243331437901a(25) =915276550503
External references
- oeis: A203253