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 | 3 |
| 3 | 5 |
| 4 | 35 |
| 5 | 63 |
| 6 | 231 |
| 7 | 429 |
| 8 | 6435 |
| 9 | 12155 |
| 10 | 46189 |
| 11 | 88179 |
| 12 | 676039 |
| 13 | 1300075 |
| 14 | 5014575 |
| 15 | 9694845 |
| 16 | 300540195 |
| 17 | 583401555 |
| 18 | 2268783825 |
| 19 | 4418157975 |
| 20 | 34461632205 |
| 21 | 67282234305 |
| 22 | 263012370465 |
| 23 | 514589420475 |
| 24 | 8061900920775 |
| 25 | 15801325804719 |