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 | 1 |
| 2 | 576 |
| 3 | 30618 |
| 4 | 532480 |
| 5 | 4921875 |
| 6 | 30373056 |
| 7 | 141649396 |
| 8 | 537919488 |
| 9 | 1745783685 |
| 10 | 5005000000 |
| 11 | 12978455886 |
| 12 | 30976598016 |
| 13 | 68960620183 |
| 14 | 144680034240 |
| 15 | 288410625000 |
| 16 | 549890031616 |
| 17 | 1008202119561 |
| 18 | 1785539723328 |
| 19 | 3065980064770 |