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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 17 |
| 6 | 104 |
| 7 | 816 |
| 8 | 10933 |
| 9 | 259298 |
| 10 | 11685545 |
| 11 | 1005551939 |
| 12 | 163973291348 |
| 13 | 50323109433351 |
| 14 | 28999867293155772 |
| 15 | 31395440775755417399 |
| 16 | 63967594175789887438112 |
| 17 | 245868065133951888388878298 |