a(n) = floor(Gamma(n+1/12)/Gamma(1/12)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =12a(7) =73a(8) =518a(9) =4192a(10) =38083a(11) =384010a(12) =4256112a(13) =51428023a(14) =672849973a(15) =9475970454a(16) =142929221023