a(n) = Sum_{k=1..n} Sum_{j=1..k} Sum_{i=1..j} (i*j*k)^2.

Terms

a(0) =0a(1) =1a(2) =85a(3) =1408a(4) =11440a(5) =61490a(6) =251498a(7) =846260a(8) =2458676a(9) =6369275a(10) =15047175a(11) =32955780a(12) =67746900a(13) =131969604a(14) =245444980a(15) =438485080a(16) =756163672a(17) =1263878005a(18) =2054474617a(19) =3257248280a(20) =5049161480a(21) =7668672374a(22) =11432601950a(23) =16756516140a(24) =24179145900a(25) =34391417775