a(n) = n^4*(3*n+2).

Terms

a(0) =0a(1) =5a(2) =128a(3) =891a(4) =3584a(5) =10625a(6) =25920a(7) =55223a(8) =106496a(9) =190269a(10) =320000a(11) =512435a(12) =787968a(13) =1171001a(14) =1690304a(15) =2379375a(16) =3276800a(17) =4426613a(18) =5878656a(19) =7688939a(20) =9920000a(21) =12641265a(22) =15929408a(23) =19868711a(24) =24551424a(25) =30078125a(26) =36558080a(27) =44109603a(28) =52860416a(29) =62948009