a(n) = numerator of Sum_{d|n} (d/pod(d)) where pod(k) = the product of the divisors of k (A007955).

Terms

a(0) =1a(1) =2a(2) =2a(3) =5a(4) =2a(5) =19a(6) =2a(7) =21a(8) =7a(9) =31a(10) =2a(11) =529a(12) =2a(13) =43a(14) =46a(15) =169a(16) =2a(17) =1135a(18) =2a(19) =1441a(20) =64a(21) =67a(22) =2a(23) =52513a(24) =11a(25) =79a(26) =64a(27) =2801a(28) =2a(29) =117001