a(n) = direuler(p=2,n,1/(1-X)/(1-p*n*X))[n].

Terms

a(0) =1a(1) =5a(2) =10a(3) =73a(4) =26a(5) =247a(6) =50a(7) =4369a(8) =757a(9) =1071a(10) =122a(11) =22237a(12) =170a(13) =2871a(14) =3496a(15) =1082401a(16) =290a(17) =109927a(18) =362a(19) =165741a(20) =9472a(21) =10935a(22) =530a(23) =8244985a(24) =15751a(25) =17967a(26) =538084a(27) =629021a(28) =842a(29) =838201