a(n) = Sum_{k=1..n-1} k^4*sigma(k)*sigma(n-k).

Terms

a(0) =0a(1) =1a(2) =51a(3) =472a(4) =2963a(5) =10764a(6) =36538a(7) =95936a(8) =222561a(9) =502638a(10) =974245a(11) =1850784a(12) =3234269a(13) =5826680a(14) =8857926a(15) =15093248a(16) =21945012a(17) =35369541a(18) =48358119a(19) =74448464a(20) =98697648a(21) =148971972a(22) =187495262a(23) =276509952a(24) =336495665a(25) =488970662a(26) =590163894a(27) =823791168a(28) =966018241a(29) =1358404776