a(n) is the numerator of the asymptotic density of numbers divisible by their last digit in base n.

Terms

a(0) =1a(1) =1a(2) =7a(3) =5a(4) =37a(5) =7a(6) =421a(7) =347a(8) =1177a(9) =671a(10) =14939a(11) =6617a(12) =135451a(13) =140311a(14) =271681a(15) =143327a(16) =5096503a(17) =751279a(18) =91610357a(19) =24080311a(20) =9098461a(21) =830139a(22) =2188298491a(23) =77709491a(24) =925316723a(25) =6609819823a(26) =3567606143a(27) =10876020307a(28) =123417992791a(29) =300151059037