a(n) is the number of numbers of the form k + reverse(k) for at least one n-digit number k.
A358985
a(n) is the number of numbers of the form k + reverse(k) for at least one n-digit number k.
Terms
- a(0) =10a(1) =18a(2) =180a(3) =342a(4) =3420a(5) =6498a(6) =64980a(7) =123462a(8) =1234620a(9) =2345778a(10) =23457780a(11) =44569782a(12) =445697820a(13) =846825858a(14) =8468258580a(15) =16089691302a(16) =160896913020a(17) =305704134738
External references
- oeis: A358985