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 | 4 |
| 4 | 11 |
| 5 | 41 |
| 6 | 161 |
| 7 | 694 |
| 8 | 3151 |
| 9 | 14851 |
| 10 | 71621 |
| 11 | 350384 |
| 12 | 1729091 |
| 13 | 8577661 |
| 14 | 42686281 |
| 15 | 212828074 |
| 16 | 1062335831 |
| 17 | 5306276471 |
| 18 | 26515196141 |
| 19 | 132527465764 |
| 20 | 662491871371 |
| 21 | 3312023159281 |
| 22 | 16558807553201 |
| 23 | 82790113735454 |
| 24 | 413938797983711 |