a(n) = round( Gamma(n+1/4)/Gamma(1/4) ).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =10a(6) =51a(7) =319a(8) =2310a(9) =19061a(10) =176310a(11) =1807181a(12) =20330789a(13) =249052162a(14) =3299941145a(15) =47024161317a(16) =717118460090