a(n) = floor(Gamma(n+2/11)/Gamma(2/11)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =6a(6) =32a(7) =199a(8) =1435a(9) =11741a(10) =107809a(11) =1097700a(12) =12274282a(13) =149523079a(14) =1970986052a(15) =27952165838a(16) =424364699554