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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 14 |
| 4 | 43 |
| 5 | 127 |
| 6 | 468 |
| 7 | 1596 |
| 8 | 5253 |
| 9 | 17917 |
| 10 | 60918 |
| 11 | 205194 |
| 12 | 694287 |
| 13 | 2351611 |
| 14 | 7951336 |
| 15 | 26894840 |
| 16 | 91004105 |
| 17 | 307854073 |
| 18 | 1041410602 |
| 19 | 3523170438 |
| 20 | 11918842803 |
| 21 | 40320750711 |
| 22 | 136404504124 |
| 23 | 461454010164 |
| 24 | 1561085306061 |
| 25 | 5281113937653 |