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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 32 |
| 5 | 171 |
| 6 | 1110 |
| 7 | 8148 |
| 8 | 68500 |
| 9 | 637688 |
| 10 | 6592438 |
| 11 | 74324893 |
| 12 | 913096970 |
| 13 | 12092478469 |
| 14 | 172257496610 |
| 15 | 2621329989642 |
| 16 | 42504082679852 |
| 17 | 730902589691526 |
| 18 | 13296176824037236 |
| 19 | 254998358579025213 |
| 20 | 5144120812828240642 |
| 21 | 108867706910988952663 |
| 22 | 2412334062040643706424 |
| 23 | 55847969248056742007556 |