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 | 6 |
| 2 | 134 |
| 3 | 5052 |
| 4 | 267576 |
| 5 | 18246850 |
| 6 | 1521907056 |
| 7 | 150077897088 |
| 8 | 17080661438336 |
| 9 | 2203559337858174 |
| 10 | 317761804144896000 |
| 11 | 50650336389453807556 |
| 12 | 8843008543955452118016 |
| 13 | 1678231571506037926192698 |
| 14 | 343989152383931539269349376 |
| 15 | 75733086648535784012234565000 |