a(n) = Sum_{k=1..n-1} k^5*sigma(k)*sigma(n-k).

Terms

a(0) =0a(1) =1a(2) =99a(3) =1264a(4) =10475a(5) =44820a(6) =185626a(7) =546560a(8) =1454841a(9) =3640950a(10) =7868245a(11) =16042176a(12) =31040789a(13) =59796968a(14) =97525350a(15) =177090560a(16) =276689076a(17) =467100189a(18) =681356055a(19) =1096023200a(20) =1533162960a(21) =2426544252a(22) =3205401854a(23) =4885539840a(24) =6250705625a(25) =9431254430a(26) =11831779350