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.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 14 |
| 2 | 122 |
| 3 | 1094 |
| 4 | 9842 |
| 5 | 88574 |
| 6 | 797162 |
| 7 | 7174454 |
| 8 | 64570082 |
| 9 | 581130734 |
| 10 | 5230176602 |
| 11 | 47071589414 |
| 12 | 423644304722 |
| 13 | 3812798742494 |
| 14 | 34315188682442 |
| 15 | 308836698141974 |
| 16 | 2779530283277762 |
| 17 | 25015772549499854 |
| 18 | 225141952945498682 |
| 19 | 2026277576509488134 |
| 20 | 18236498188585393202 |