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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 30 |
| 5 | 55 |
| 6 | 819 |
| 7 | 506 |
| 8 | 1785 |
| 9 | 1015 |
| 10 | 16206 |
| 11 | 51039 |
| 12 | 98021 |
| 13 | 81375 |
| 14 | 1113775 |
| 15 | 964535 |
| 16 | 2607099 |
| 17 | 5494655 |
| 18 | 1048061 |
| 19 | 6029275 |
| 20 | 50331190 |
| 21 | 356343295 |
| 22 | 534555645 |
| 23 | 516941815 |
| 24 | 4021378559 |
| 25 | 2143222510 |
| 26 | 12842950505 |
| 27 | 34091142526 |
| 28 | 68651299705 |
| 29 | 124545644405 |
| 30 | 273736383990 |