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 | 3 |
| 7 | 3 |
| 8 | 13 |
| 9 | 21 |
| 10 | 157 |
| 11 | 536 |
| 12 | 18942 |
| 13 | 389404 |
| 14 | 50314456 |
| 15 | 2942196832 |
| 16 | 1698517018391 |