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 | 2 |
| 4 | 10 |
| 5 | 62 |
| 6 | 469 |
| 7 | 4028 |
| 8 | 37984 |
| 9 | 385202 |
| 10 | 4144798 |
| 11 | 46882400 |
| 12 | 553733875 |
| 13 | 6795347708 |
| 14 | 86314711993 |
| 15 | 1131422763410 |
| 16 | 15268625617174 |
| 17 | 211726229534738 |
| 18 | 3012057754693912 |
| 19 | 43903115899714844 |
| 20 | 654923002676505376 |
| 21 | 9989373316478767304 |
| 22 | 155663132037403882606 |
| 23 | 2476418549848925209424 |
| 24 | 40195761790035415573939 |