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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 41 |
| 6 | 479 |
| 7 | 59 |
| 8 | 266681 |
| 9 | 63397 |
| 10 | 514639 |
| 11 | 178939 |
| 12 | 10410343 |
| 13 | 18500393 |
| 14 | 40799043101 |
| 15 | 1411432849 |
| 16 | 6620481151 |
| 17 | 48409924397 |
| 18 | 238357395880861 |
| 19 | 339716530787 |
| 20 | 86364397717734821 |
| 21 | 421950627598601 |
| 22 | 222226462279 |
| 23 | 15392144025383 |