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 | 12 |
| 4 | 461 |
| 5 | 27004 |
| 6 | 798271 |
| 7 | 32668081 |
| 8 | 959129557 |
| 9 | 35695709940 |
| 10 | 1078854669486 |
| 11 | 39147687661803 |
| 12 | 1224448528652016 |
| 13 | 44252532348552226 |