a(n) = n*(n+1)*(2n+1)*(3n+1)*(4n+1)/30.

Terms

a(0) =0a(1) =4a(2) =63a(3) =364a(4) =1326a(5) =3696a(6) =8645a(7) =17864a(8) =33660a(9) =59052a(10) =97867a(11) =154836a(12) =235690a(13) =347256a(14) =497553a(15) =695888a(16) =952952a(17) =1280916a(18) =1693527a(19) =2206204a(20) =2836134a(21) =3602368a(22) =4525917a(23) =5629848a(24) =6939380a(25) =8481980a(26) =10287459a(27) =12388068a(28) =14818594a(29) =17616456