a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)*x^k*(1 + x^k)/(k*(1 - x^k)^n)).

A305655

a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)*x^k*(1 + x^k)/(k*(1 - x^k)^n)).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =54a(5) =290a(6) =1674a(7) =10857a(8) =76398a(9) =580230a(10) =4706734a(11) =40598349a(12) =370694845a(13) =3569027696a(14) =36100349833a(15) =382360758863

External references