a(n) = 2*(n-1)*(n^2 + 1).

Terms

a(0) =0a(1) =10a(2) =40a(3) =102a(4) =208a(5) =370a(6) =600a(7) =910a(8) =1312a(9) =1818a(10) =2440a(11) =3190a(12) =4080a(13) =5122a(14) =6328a(15) =7710a(16) =9280a(17) =11050a(18) =13032a(19) =15238a(20) =17680a(21) =20370a(22) =23320a(23) =26542a(24) =30048a(25) =33850a(26) =37960a(27) =42390a(28) =47152a(29) =52258