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 | 6 |
| 4 | 19 |
| 5 | 62 |
| 6 | 239 |
| 7 | 1013 |
| 8 | 4723 |
| 9 | 23870 |
| 10 | 129779 |
| 11 | 753784 |
| 12 | 4651285 |
| 13 | 30349577 |
| 14 | 208575027 |
| 15 | 1504582526 |
| 16 | 11358446495 |
| 17 | 89501837358 |
| 18 | 734420232291 |
| 19 | 6262593615501 |
| 20 | 55392254339667 |
| 21 | 507335283474158 |
| 22 | 4804245661175599 |
| 23 | 46971060027956608 |
| 24 | 473534995965134505 |
| 25 | 4916730522706507665 |