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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 7 |
| 6 | 34 |
| 7 | 174 |
| 8 | 1079 |
| 9 | 7055 |
| 10 | 48796 |
| 11 | 366180 |
| 12 | 2928387 |
| 13 | 24726556 |
| 14 | 220572828 |
| 15 | 2071469527 |
| 16 | 20393131971 |
| 17 | 209934610376 |
| 18 | 2254860549906 |
| 19 | 25210893460938 |
| 20 | 292826210789807 |
| 21 | 3527105947667676 |
| 22 | 43985152403166462 |
| 23 | 567048383126842506 |
| 24 | 7546842245268945427 |
| 25 | 103560659196050026908 |