Ceiling of Gamma(n+1/6)/Gamma(1/6).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =6a(6) =29a(7) =178a(8) =1270a(9) =10366a(10) =95020a(11) =966033a(12) =10787363a(13) =131246246a(14) =1728075563a(15) =24481070470a(16) =371296235456