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) |
|---|---|
| 1 | 6 |
| 2 | 30 |
| 3 | 177 |
| 4 | 1246 |
| 5 | 9629 |
| 6 | 78627 |
| 7 | 664918 |
| 8 | 5762209 |
| 9 | 50849234 |
| 10 | 455055614 |
| 11 | 4118066400 |
| 12 | 37607950280 |
| 13 | 346065645810 |
| 14 | 3204942065691 |
| 15 | 29844571475287 |
| 16 | 279238344248556 |
| 17 | 2623557165610821 |
| 18 | 24739954309690415 |
| 19 | 234057667376222382 |