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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 20 |
| 5 | 55 |
| 6 | 667 |
| 7 | 1856 |
| 8 | 22646 |
| 9 | 63037 |
| 10 | 769285 |
| 11 | 2141390 |
| 12 | 26133032 |
| 13 | 72744211 |
| 14 | 887753791 |
| 15 | 2471161772 |
| 16 | 30157495850 |
| 17 | 83946756025 |
| 18 | 1024467105097 |
| 19 | 2851718543066 |
| 20 | 34801724077436 |
| 21 | 96874483708207 |
| 22 | 1182234151527715 |
| 23 | 3290880727535960 |
| 24 | 40161159427864862 |