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 | 1 |
| 2 | 5 |
| 3 | 73 |
| 4 | 2017 |
| 5 | 86801 |
| 6 | 5289301 |
| 7 | 430814665 |
| 8 | 45052534913 |
| 9 | 5868875082817 |
| 10 | 930114039075301 |
| 11 | 175964489469769001 |
| 12 | 39125942325820605025 |
| 13 | 10092849114680961297553 |
| 14 | 2987365449592984040715317 |
| 15 | 1005030253302269078318250601 |