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 | 1 |
| 2 | 478 |
| 3 | 1541 |
| 4 | 4866 |
| 5 | 988113 |
| 6 | 4216353 |
| 7 | 15155321 |
| 8 | 16977521 |
| 9 | 983990258 |
| 10 | 531956543121 |
| 11 | 544826911685686 |
| 12 | 16843306612090658 |
| 13 | 127392946577229686 |