E.g.f.: Product_{k>=1} 1 / (1 - x^k)^(exp(-x)/k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =15a(5) =44a(6) =485a(7) =1854a(8) =25781a(9) =170288a(10) =2477485a(11) =12571140a(12) =435748665a(13) =2049818198a(14) =64651106637a(15) =628176476186