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 | 57 |
| 3 | 605 |
| 4 | 5937 |
| 5 | 55925 |
| 6 | 515817 |
| 7 | 4704845 |
| 8 | 42656097 |
| 9 | 385467365 |
| 10 | 3477018777 |
| 11 | 31332231485 |
| 12 | 282185395857 |
| 13 | 2540645125205 |
| 14 | 22870688939337 |
| 15 | 205860614516525 |
| 16 | 1852867600961217 |
| 17 | 16676418760213445 |
| 18 | 150090820599733497 |