a(n) = Sum_{k=1..n} k^Omega(k).

Terms

a(0) =1a(1) =3a(2) =6a(3) =22a(4) =27a(5) =63a(6) =70a(7) =582a(8) =663a(9) =763a(10) =774a(11) =2502a(12) =2515a(13) =2711a(14) =2936a(15) =68472a(16) =68489a(17) =74321a(18) =74340a(19) =82340a(20) =82781a(21) =83265a(22) =83288a(23) =415064a(24) =415689a(25) =416365a(26) =436048a(27) =458000a(28) =458029a(29) =485029