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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 10 |
| 6 | 21 |
| 7 | 39 |
| 8 | 86 |
| 9 | 182 |
| 10 | 440 |
| 11 | 1074 |
| 12 | 2941 |
| 13 | 8424 |
| 14 | 26720 |
| 15 | 90883 |
| 16 | 340253 |
| 17 | 1384567 |
| 18 | 6186907 |
| 19 | 30219769 |
| 20 | 161763233 |
| 21 | 946742190 |
| 22 | 6054606722 |
| 23 | 42229136988 |
| 24 | 320741332093 |
| 25 | 2648348712904 |