G.f.: Sum_{n>=0} x^n * (1 + (1+x)^n)^n / (1 - x*(1+x)^n)^(n+1).
A325059
G.f.: Sum_{n>=0} x^n * (1 + (1+x)^n)^n / (1 - x*(1+x)^n)^(n+1).
Terms
- a(0) =1a(1) =3a(2) =10a(3) =41a(4) =190a(5) =973a(6) =5413a(7) =32351a(8) =205966a(9) =1387807a(10) =9845083a(11) =73215780a(12) =568757151a(13) =4601092084a(14) =38660287934a(15) =336623442207
External references
- oeis: A325059