Ceiling of Gamma(n+2/5)/Gamma(2/5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =21a(6) =109a(7) =695a(8) =5143a(9) =43194a(10) =406017a(11) =4222570a(12) =48137292a(13) =596902409a(14) =7998492274a(15) =115178288737