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 | 14 |
| 5 | 65 |
| 6 | 316 |
| 7 | 1742 |
| 8 | 10079 |
| 9 | 61680 |
| 10 | 391473 |
| 11 | 2565262 |
| 12 | 17237962 |
| 13 | 118341446 |
| 14 | 827194809 |
| 15 | 5872518213 |
| 16 | 42256545977 |
| 17 | 307681822711 |
| 18 | 2263881127801 |
| 19 | 16813356777456 |
| 20 | 125917441081662 |
| 21 | 950148951332802 |
| 22 | 7218810159035143 |
| 23 | 55187741462110393 |
| 24 | 424318236236124092 |