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 | 24 |
| 5 | 910 |
| 6 | 18387 |
| 7 | 286758 |
| 8 | 3884936 |
| 9 | 48396263 |
| 10 | 571221133 |
| 11 | 6499261245 |
| 12 | 72047682376 |
| 13 | 783561421371 |
| 14 | 8399470576016 |
| 15 | 89038389261794 |
| 16 | 935562667202846 |
| 17 | 9761003371437806 |
| 18 | 101253973351371824 |
| 19 | 1045354835981786609 |