a(n) = binomial(A007310(n+1),n+1)/A007310(n+1).

Terms

a(0) =1a(1) =2a(2) =5a(3) =30a(4) =99a(5) =728a(6) =2652a(7) =21318a(8) =81719a(9) =690690a(10) =2731365a(11) =23841480a(12) =96282900a(13) =859515920a(14) =3524015272a(15) =31983672534a(16) =132638171391