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 | 0 |
| 2 | 1 |
| 3 | 21 |
| 4 | 1897 |
| 5 | 32197 |
| 6 | 20881861 |
| 7 | 7139587 |
| 8 | 17462165587 |
| 9 | 283355376967 |
| 10 | 69621962857381 |
| 11 | 70246946681461 |
| 12 | 1036088178214798501 |
| 13 | 1042504974775473001 |
| 14 | 29931734181763981573561 |
| 15 | 4295332813075795410223 |
| 16 | 4312254507400142830831 |