a(n) is the number of k for which binomial(n,k) is divisible by n.

Terms

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