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 | 0 |
| 1 | 1 |
| 2 | 23 |
| 3 | 333 |
| 4 | 2916 |
| 5 | 16725 |
| 6 | 70911 |
| 7 | 241913 |
| 8 | 701968 |
| 9 | 1798281 |
| 10 | 4173775 |
| 11 | 8942021 |
| 12 | 17930628 |
| 13 | 34009053 |
| 14 | 61518471 |
| 15 | 106823025 |
| 16 | 179003456 |
| 17 | 290715793 |
| 18 | 459239463 |
| 19 | 707740861 |
| 20 | 1066780100 |
| 21 | 1576090341 |
| 22 | 2286660783 |
| 23 | 3263156073 |
| 24 | 4586706576 |