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 | 3 |
| 5 | 5 |
| 6 | 13 |
| 7 | 27 |
| 8 | 66 |
| 9 | 153 |
| 10 | 377 |
| 11 | 914 |
| 12 | 2281 |
| 13 | 5690 |
| 14 | 14397 |
| 15 | 36564 |
| 16 | 93650 |
| 17 | 240916 |
| 18 | 623338 |
| 19 | 1619346 |
| 20 | 4224993 |
| 21 | 11062046 |
| 22 | 29062341 |
| 23 | 76581151 |
| 24 | 202365823 |
| 25 | 536113477 |
| 26 | 1423665699 |
| 27 | 3788843391 |
| 28 | 10103901486 |
| 29 | 26995498151 |
| 30 | 72253682560 |
| 31 | 193706542776 |