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 | 1 |
| 3 | 5 |
| 4 | 11 |
| 5 | 48 |
| 6 | 173 |
| 7 | 795 |
| 8 | 3719 |
| 9 | 19343 |
| 10 | 106563 |
| 11 | 628508 |
| 12 | 3923602 |
| 13 | 25875858 |
| 14 | 179468739 |
| 15 | 1305268102 |
| 16 | 9925892324 |
| 17 | 78728325373 |
| 18 | 649856661196 |
| 19 | 5571421770478 |
| 20 | 49521735963376 |
| 21 | 455616186779543 |
| 22 | 4332419124871058 |
| 23 | 42520560822961111 |
| 24 | 430191406640367880 |