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 | 12 |
| 2 | 84 |
| 3 | 558 |
| 4 | 3696 |
| 5 | 24582 |
| 6 | 164304 |
| 7 | 1103478 |
| 8 | 7444416 |
| 9 | 50431302 |
| 10 | 342941424 |
| 11 | 2340123798 |
| 12 | 16018069536 |
| 13 | 109949704422 |
| 14 | 756587236944 |
| 15 | 5217746494518 |
| 16 | 36054040477056 |
| 17 | 249557173431942 |
| 18 | 1729973554578864 |
| 19 | 12008254925383638 |