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 | 5 |
| 2 | 40 |
| 3 | 260 |
| 4 | 1820 |
| 5 | 12376 |
| 6 | 85085 |
| 7 | 582505 |
| 8 | 3994320 |
| 9 | 27372840 |
| 10 | 187628376 |
| 11 | 1285992240 |
| 12 | 8814405145 |
| 13 | 60414613805 |
| 14 | 414088493560 |
| 15 | 2838203264876 |
| 16 | 19453338487220 |
| 17 | 133335155341960 |
| 18 | 913892777190965 |
| 19 | 6263914210945105 |