Nearest integer to Gamma(n + 5/7)/Gamma(5/7).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =12a(5) =58a(6) =333a(7) =2233a(8) =17225a(9) =150104a(10) =1458150a(11) =15623032a(12) =183012659a(13) =2326875239a(14) =31911431853a(15) =469553925838