Wiener index of the n X n X n grid graph.

Terms

a(0) =0a(1) =48a(2) =972a(3) =7680a(4) =37500a(5) =136080a(6) =403368a(7) =1032192a(8) =2361960a(9) =4950000a(10) =9663060a(11) =17791488a(12) =31188612a(13) =52437840a(14) =85050000a(15) =133693440a(16) =204459408a(17) =305165232a(18) =445697820a(19) =638400000a(20) =898502220a(21) =1244602128a(22) =1699194552a(23) =2289254400a(24) =3046875000a(25) =4009964400a(26) =5223002148