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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 4 |
| 7 | 4 |
| 8 | 15 |
| 9 | 23 |
| 10 | 162 |
| 11 | 540 |
| 12 | 18958 |
| 13 | 389417 |
| 14 | 50314520 |
| 15 | 2942196930 |
| 16 | 1698517018988 |