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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 8 |
| 7 | 45 |
| 8 | 419 |
| 9 | 4798 |
| 10 | 62754 |
| 11 | 872411 |
| 12 | 12728018 |
| 13 | 192324654 |
| 14 | 2991463239 |
| 15 | 47663036427 |
| 16 | 775158142233 |
| 17 | 12831576165782 |