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 | 8 |
| 4 | 8008 |
| 5 | 120232021 |
| 6 | 124060421 |
| 7 | 161656161 |
| 8 | 185464581 |
| 9 | 544721127445 |
| 10 | 616947749616 |
| 11 | 3333169613333 |
| 12 | 3333802083333 |
| 13 | 6506939396056 |
| 14 | 12212500521221 |
| 15 | 5466543663456645 |
| 16 | 3310988011108890133 |
| 17 | 520752145595541257025 |
| 18 | 336753352502205253357633 |