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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 10 |
| 6 | 29 |
| 7 | 64 |
| 8 | 194 |
| 9 | 531 |
| 10 | 1733 |
| 11 | 5524 |
| 12 | 19430 |
| 13 | 69322 |
| 14 | 262044 |
| 15 | 1016740 |
| 16 | 4101318 |
| 17 | 16996157 |
| 18 | 72556640 |
| 19 | 317558689 |
| 20 | 1424644848 |
| 21 | 6536588420 |
| 22 | 30647561117 |
| 23 | 146647344812 |
| 24 | 715511358833 |
| 25 | 3556531372395 |
| 26 | 17996244725780 |
| 27 | 92634418530686 |
| 28 | 484756161038264 |