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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 29 |
| 7 | 72 |
| 8 | 182 |
| 9 | 466 |
| 10 | 1207 |
| 11 | 3158 |
| 12 | 8334 |
| 13 | 22158 |
| 14 | 59299 |
| 15 | 159614 |
| 16 | 431838 |
| 17 | 1173710 |
| 18 | 3203244 |
| 19 | 8774780 |
| 20 | 24118522 |
| 21 | 66497316 |
| 22 | 183858411 |
| 23 | 509670494 |
| 24 | 1416231616 |
| 25 | 3944027402 |
| 26 | 11006186760 |
| 27 | 30772507128 |
| 28 | 86191006746 |
| 29 | 241815195292 |