a(n) = sigma_1(n) * sigma_3(n).

Terms

a(0) =1a(1) =27a(2) =112a(3) =511a(4) =756a(5) =3024a(6) =2752a(7) =8775a(8) =9841a(9) =20412a(10) =15984a(11) =57232a(12) =30772a(13) =74304a(14) =84672a(15) =145111a(16) =88452a(17) =265707a(18) =137200a(19) =386316a(20) =308224a(21) =431568a(22) =292032a(23) =982800a(24) =488281a(25) =830844a(26) =817600a(27) =1406272a(28) =731700a(29) =2286144