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 | 6 |
| 1 | 0 |
| 2 | 84 |
| 3 | 48 |
| 4 | 738 |
| 5 | 816 |
| 6 | 5520 |
| 7 | 8904 |
| 8 | 49662 |
| 9 | 79200 |
| 10 | 449028 |
| 11 | 812352 |
| 12 | 3772350 |
| 13 | 7762032 |
| 14 | 31487916 |
| 15 | 72083112 |
| 16 | 266083134 |
| 17 | 654302352 |
| 18 | 2277479412 |
| 19 | 5812957368 |
| 20 | 19418064216 |
| 21 | 51144852552 |
| 22 | 165263023776 |
| 23 | 447259989384 |