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 | 1 |
| 3 | 3 |
| 4 | 19 |
| 5 | 391 |
| 6 | 25428 |
| 7 | 5422820 |
| 8 | 3868544673 |
| 9 | 9374373474455 |
| 10 | 78121590505558308 |
| 11 | 2262375741577763676620 |
| 12 | 229653423345084153764141412 |
| 13 | 82310438395814327559991274396712 |
| 14 | 104810153877236566878585186368604425875 |