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 | 4 |
| 4 | 9 |
| 5 | 22 |
| 6 | 59 |
| 7 | 172 |
| 8 | 547 |
| 9 | 1886 |
| 10 | 7047 |
| 11 | 28360 |
| 12 | 122675 |
| 13 | 567210 |
| 14 | 2796999 |
| 15 | 14641044 |
| 16 | 81191947 |
| 17 | 475148678 |
| 18 | 2929442263 |
| 19 | 18965690560 |
| 20 | 128754649699 |
| 21 | 914056305794 |
| 22 | 6777666961735 |
| 23 | 52367331911180 |
| 24 | 421188392986843 |
| 25 | 3519168714308702 |
| 26 | 30519733808467031 |