a(n) = floor( Gamma(n+3/8)/Gamma(3/8) ).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =18a(6) =97a(7) =619a(8) =4569a(9) =38269a(10) =358778a(11) =3722325a(12) =42341447a(13) =523975411a(14) =7008171124a(15) =100742459918