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 | 14 |
| 2 | 112 |
| 3 | 854 |
| 4 | 6496 |
| 5 | 49574 |
| 6 | 379792 |
| 7 | 2920694 |
| 8 | 22542016 |
| 9 | 174571334 |
| 10 | 1356217072 |
| 11 | 10567261334 |
| 12 | 82560763936 |
| 13 | 646644824294 |
| 14 | 5076269583952 |
| 15 | 39931933598774 |
| 16 | 314707907280256 |
| 17 | 2484430327672454 |
| 18 | 19642812107392432 |
| 19 | 155514083261229014 |