Ceiling of Gamma(n+4/9)/Gamma(4/9).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =25a(6) =131a(7) =843a(8) =6275a(9) =52989a(10) =500443a(11) =5226842a(12) =59818301a(13) =744405516a(14) =10008118595a(15) =144561713038