a(n) = floor( Gamma(n+5/8)/Gamma(5/8) ).

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =9a(5) =44a(6) =251a(7) =1665a(8) =12700a(9) =109544a(10) =1054363a(11) =11202616a(12) =130230419a(13) =1644159040a(14) =22401666926a(15) =327624378797