a(n) = floor(Gamma(n+9/11)/Gamma(9/11)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =4a(4) =16a(5) =77a(6) =448a(7) =3059a(8) =23919a(9) =210929a(10) =2070940a(11) =22403814a(12) =264772349a(13) =3393900115a(14) =46897528866a(15) =694936109571