Ceiling of Gamma(n + 7/9)/Gamma(7/9).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =70a(6) =401a(7) =2715a(8) =21116a(9) =185346a(10) =1812264a(11) =19532171a(12) =230045569a(13) =2939471158a(14) =40499380397a(15) =598490843643