a(n) = 30*n^4 - 120*n^3 + 120*n^2 - 19.

Terms

a(0) =-19a(1) =11a(2) =-19a(3) =251a(4) =1901a(5) =6731a(6) =17261a(7) =36731a(8) =69101a(9) =119051a(10) =191981a(11) =294011a(12) =431981a(13) =613451a(14) =846701a(15) =1140731a(16) =1505261a(17) =1950731a(18) =2488301a(19) =3129851a(20) =3887981a(21) =4776011a(22) =5807981a(23) =6998651a(24) =8363501a(25) =9918731a(26) =11681261a(27) =13668731a(28) =15899501a(29) =18392651