a(n) = (n+1)^3*(n+2)^2*(n+5).

Terms

a(0) =20a(1) =432a(2) =3024a(3) =12800a(4) =40500a(5) =105840a(6) =241472a(7) =497664a(8) =947700a(9) =1694000a(10) =2874960a(11) =4672512a(12) =7320404a(13) =11113200a(14) =16416000a(15) =23674880a(16) =33428052a(17) =46317744a(18) =63102800a(19) =84672000a(20) =112058100a(21) =146452592a(22) =189221184a(23) =241920000a(24) =306312500a(25) =384387120