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 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 33 |
| 8 | 88 |
| 9 | 611 |
| 10 | 1803 |
| 11 | 2985 |
| 12 | 21250 |
| 13 | 23564 |
| 14 | 100221 |
| 15 | 392655 |
| 16 | 438188 |
| 17 | 433150 |
| 18 | 4762862 |
| 19 | 2327445 |
| 20 | 18839643 |
| 21 | 46717154 |