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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 22 |
| 6 | 102 |
| 7 | 681 |
| 8 | 6203 |
| 9 | 72757 |
| 10 | 1050276 |
| 11 | 18042102 |
| 12 | 359677460 |
| 13 | 8162936051 |
| 14 | 207764278875 |
| 15 | 5859801873585 |
| 16 | 181362065062507 |
| 17 | 6110186925475928 |
| 18 | 222566852684792616 |
| 19 | 8714776224549448369 |
| 20 | 364990993734909935670 |
| 21 | 16280201717192275756034 |
| 22 | 770443051001734848973196 |
| 23 | 38553687900969746513992234 |