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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 25 |
| 6 | 83 |
| 7 | 330 |
| 8 | 1538 |
| 9 | 8834 |
| 10 | 63723 |
| 11 | 591313 |
| 12 | 7180087 |
| 13 | 115411088 |
| 14 | 2472336977 |
| 15 | 70840464484 |
| 16 | 2720170935989 |
| 17 | 140167035897433 |
| 18 | 9702508891845883 |
| 19 | 903305670556552694 |
| 20 | 113233954374954246849 |
| 21 | 19137449587197829494989 |
| 22 | 4366006746295284220605007 |