Nearest integer to Gamma(n + 1/3).

Terms

a(0) =3a(1) =1a(2) =1a(3) =3a(4) =9a(5) =40a(6) =214a(7) =1355a(8) =9940a(9) =82834a(10) =773118a(11) =7988888a(12) =90540730a(13) =1116669003a(14) =14888920041a(15) =213407853923