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 | 3 |
| 3 | 10 |
| 4 | 39 |
| 5 | 174 |
| 6 | 872 |
| 7 | 4805 |
| 8 | 28474 |
| 9 | 178099 |
| 10 | 1160173 |
| 11 | 7803860 |
| 12 | 53924841 |
| 13 | 381640934 |
| 14 | 2761331130 |
| 15 | 20400560942 |
| 16 | 153738854242 |
| 17 | 1180631743440 |
| 18 | 9229687049249 |
| 19 | 73372263658451 |
| 20 | 592476077260123 |
| 21 | 4854377724124700 |
| 22 | 40315729803287046 |
| 23 | 339065862485375334 |
| 24 | 2885324166565733641 |