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 | 5 |
| 4 | 13 |
| 5 | 40 |
| 6 | 131 |
| 7 | 481 |
| 8 | 1857 |
| 9 | 7600 |
| 10 | 32235 |
| 11 | 141203 |
| 12 | 633383 |
| 13 | 2899885 |
| 14 | 13498337 |
| 15 | 63734268 |
| 16 | 304606922 |
| 17 | 1471339736 |
| 18 | 7173341171 |
| 19 | 35262128485 |
| 20 | 174617051093 |
| 21 | 870425605393 |
| 22 | 4364815662605 |
| 23 | 22006511124267 |
| 24 | 111501534635143 |
| 25 | 567511427859428 |
| 26 | 2900508758069868 |