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 | 4 |
| 3 | 15 |
| 4 | 276 |
| 5 | 11781 |
| 6 | 1878976 |
| 7 | 1025425687 |
| 8 | 1991615557152 |
| 9 | 13956142211859705 |
| 10 | 356420795746828010496 |
| 11 | 33403125520521519582574755 |
| 12 | 11550847036800645994553295682560 |
| 13 | 14809214844165378046279886451931058885 |
| 14 | 70706990798105074752791720424861516970573824 |