Number of 6's when k is written in base b for all b and k satisfying 2<=b<=n+1, 1<=k<=n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =2a(13) =3a(14) =4a(15) =5a(16) =6a(17) =7a(18) =8a(19) =10a(20) =11a(21) =13a(22) =14a(23) =16a(24) =17a(25) =19a(26) =21a(27) =23a(28) =24a(29) =27