Ceiling of Gamma(n+4/7)/Gamma(4/7).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =38a(6) =211a(7) =1381a(8) =10451a(9) =89575a(10) =857352a(11) =9063435a(12) =104876888a(13) =1318452296a(14) =17893281148a(15) =260730668151