A377910 a(n) = number of digits in A377909(n), or 0 if A377909(n) = -1.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 4, 4, 6, 7, 8, 9, 18, 19, 20, 21, 22, 23, 24, 25
Offset: 1
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.