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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 60 |
| 6 | 7849 |
| 7 | 3459386 |
| 8 | 2585136741 |
| 9 | 2807105258926 |
| 10 | 4221456120848125 |
| 11 | 8516994772686533749 |
| 12 | 22470883220896245217626 |
| 13 | 75883288448434648617038134 |
| 14 | 322040154712674550886226182668 |