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 | 14 |
| 5 | 46 |
| 6 | 230 |
| 7 | 1066 |
| 8 | 6902 |
| 9 | 41506 |
| 10 | 329462 |
| 11 | 2441314 |
| 12 | 22934774 |
| 13 | 202229266 |
| 14 | 2193664790 |
| 15 | 22447207906 |
| 16 | 276054834902 |
| 17 | 3216941445106 |
| 18 | 44222780245622 |
| 19 | 578333776748674 |
| 20 | 8787513806478134 |
| 21 | 127464417117501586 |
| 22 | 2121181056663291350 |
| 23 | 33800841048945424546 |