Nearest integer to Gamma(n + 4/5)/Gamma(4/5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =15a(5) =74a(6) =427a(7) =2901a(8) =22624a(9) =199095a(10) =1951127a(11) =21072175a(12) =248651668a(13) =3182741351a(14) =43921830648a(15) =650043093588