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