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 | 1512 |
| 4 | 345120 |
| 5 | 3123680 |
| 6 | 11693984 |
| 7 | 28716816 |
| 8 | 55430032 |
| 9 | 92058752 |
| 10 | 138378368 |
| 11 | 194130148 |
| 12 | 259136336 |
| 13 | 333313864 |
| 14 | 416629232 |
| 15 | 509072912 |
| 16 | 610642384 |
| 17 | 721337268 |
| 18 | 841157504 |
| 19 | 970103092 |
| 20 | 1108174032 |
| 21 | 1255370324 |
| 22 | 1411691968 |
| 23 | 1577138964 |