a(n) = (Sum_{i=1..n-1} i^(n-2)) mod n^3.

Terms

a(0) =0a(1) =1a(2) =3a(3) =14a(4) =100a(5) =115a(6) =196a(7) =500a(8) =189a(9) =333a(10) =847a(11) =1022a(12) =1352a(13) =1671a(14) =1920a(15) =3432a(16) =3757a(17) =2937a(18) =1444a(19) =7730a(20) =1092a(21) =427a(22) =4232a(23) =8668a(24) =15000a(25) =13037a(26) =19197a(27) =20902a(28) =1682a(29) =17999