a(n) = floor( Gamma(n+9/10)/Gamma(9/10) ).

Terms

a(0) =1a(1) =0a(2) =1a(3) =4a(4) =19a(5) =94a(6) =559a(7) =3857a(8) =30477a(9) =271252a(10) =2685395a(11) =29270806a(12) =348322596a(13) =4493361500a(14) =62457724853a(15) =930620100318