a(n) = n^6 * Sum_{p|n, p prime} 1/p^6.

Terms

a(0) =0a(1) =1a(2) =1a(3) =64a(4) =1a(5) =793a(6) =1a(7) =4096a(8) =729a(9) =15689a(10) =1a(11) =50752a(12) =1a(13) =117713a(14) =16354a(15) =262144a(16) =1a(17) =578097a(18) =1a(19) =1004096a(20) =118378a(21) =1771625a(22) =1a(23) =3248128a(24) =15625a(25) =4826873a(26) =531441a(27) =7533632a(28) =1a(29) =12437281