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 | 22 |
| 2 | 252 |
| 3 | 2002 |
| 4 | 12396 |
| 5 | 63734 |
| 6 | 283107 |
| 7 | 1116236 |
| 8 | 3983485 |
| 9 | 13057330 |
| 10 | 39764011 |
| 11 | 113533312 |
| 12 | 306173263 |
| 13 | 784654154 |
| 14 | 1920802566 |
| 15 | 4510960122 |
| 16 | 10201294213 |
| 17 | 22286443124 |
| 18 | 47167714715 |
| 19 | 96947735390 |
| 20 | 193938666735 |
| 21 | 378324531180 |
| 22 | 720920510114 |
| 23 | 1344018408128 |
| 24 | 2454841642382 |