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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 2 |
| 11 | 22 |
| 12 | 242 |
| 13 | 2002 |
| 14 | 13442 |
| 15 | 77506 |
| 16 | 397826 |
| 17 | 1862146 |
| 18 | 8085506 |
| 19 | 32978946 |
| 20 | 127758774 |
| 21 | 482490294 |
| 22 | 2015041314 |
| 23 | 13111486674 |
| 24 | 144226353414 |
| 25 | 1835958708870 |
| 26 | 22030803357420 |
| 27 | 240151251989220 |
| 28 | 2389590181956120 |
| 29 | 21944411982069720 |
| 30 | 187919216043135720 |