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 | 9 |
| 4 | 11 |
| 5 | 20 |
| 6 | 291 |
| 7 | 311 |
| 8 | 602 |
| 9 | 2719 |
| 10 | 3321 |
| 11 | 6040 |
| 12 | 87881 |
| 13 | 93921 |
| 14 | 181802 |
| 15 | 821129 |
| 16 | 1002931 |
| 17 | 1824060 |
| 18 | 26539771 |
| 19 | 28363831 |
| 20 | 54903602 |
| 21 | 247978239 |
| 22 | 302881841 |
| 23 | 550860080 |
| 24 | 8014922961 |
| 25 | 8565783041 |
| 26 | 16580706002 |