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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 33 |
| 6 | 82 |
| 7 | 201 |
| 8 | 489 |
| 9 | 1185 |
| 10 | 2866 |
| 11 | 6925 |
| 12 | 16725 |
| 13 | 40385 |
| 14 | 97506 |
| 15 | 235409 |
| 16 | 568337 |
| 17 | 1372097 |
| 18 | 3312546 |
| 19 | 7997205 |
| 20 | 19306973 |
| 21 | 46611169 |
| 22 | 112529330 |
| 23 | 271669849 |
| 24 | 655869049 |
| 25 | 1583407969 |
| 26 | 3822685010 |
| 27 | 9228778013 |
| 28 | 22280241061 |
| 29 | 53789260161 |
| 30 | 129858761410 |