a(n) is the number of integers whose sum of divisors is 6^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =11a(5) =18a(6) =30a(7) =48a(8) =85a(9) =148a(10) =250a(11) =415a(12) =669a(13) =1066a(14) =1697a(15) =2635a(16) =4036a(17) =6111a(18) =9137a(19) =13540a(20) =19930a(21) =29098a(22) =42184a(23) =60655a(24) =86598a(25) =122821a(26) =173314a(27) =243469a(28) =340329a(29) =473221