Ceiling of Gamma(n + 1/3)/Gamma(1/3).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =15a(6) =80a(7) =506a(8) =3711a(9) =30921a(10) =288592a(11) =2982110a(12) =33797241a(13) =416832634a(14) =5557768441a(15) =79661347642