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 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 3 |
| 9 | 21 |
| 10 | 987 |
| 11 | 2178309 |
| 12 | 6557470319842 |
| 13 | 59425114757512643212875125 |
| 14 | 3016128079338728432528443992613633888712980904400501 |