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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 39 |
| 6 | 164 |
| 7 | 746 |
| 8 | 3474 |
| 9 | 16658 |
| 10 | 81166 |
| 11 | 401169 |
| 12 | 2004517 |
| 13 | 10110757 |
| 14 | 51402250 |
| 15 | 263133142 |
| 16 | 1355126922 |
| 17 | 7016115632 |
| 18 | 36498130908 |
| 19 | 190673015083 |
| 20 | 999932115039 |
| 21 | 5262094054524 |
| 22 | 27779114013628 |
| 23 | 147072756065567 |
| 24 | 780722981065006 |