Ceiling of Gamma(n+5/7)/Gamma(5/7).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =59a(6) =333a(7) =2233a(8) =17226a(9) =150104a(10) =1458150a(11) =15623032a(12) =183012660a(13) =2326875240a(14) =31911431854a(15) =469553925839