a(n) = binomial(2*n, n) mod ((n+1)*(n+2)*(n+3)*(n+4)).

Terms

a(0) =2a(1) =6a(2) =20a(3) =70a(4) =252a(5) =924a(6) =3432a(7) =990a(8) =14300a(9) =16588a(10) =17472a(11) =39676a(12) =4760a(13) =18360a(14) =46512a(15) =29070a(16) =30780a(17) =87780a(18) =0a(19) =191268a(20) =273240a(21) =322920a(22) =140400a(23) =58500a(24) =190008a(25) =350784a(26) =402752a(27) =611320a(28) =81840a(29) =649264