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 | 1 |
| 3 | 48 |
| 4 | 1280 |
| 5 | 2496 |
| 6 | 28672 |
| 7 | 29808 |
| 8 | 454656 |
| 9 | 2342912 |
| 10 | 11534336 |
| 11 | 57409536 |
| 12 | 218103808 |
| 13 | 34753216512 |
| 14 | 73014444032 |
| 15 | 583041810432 |
| 16 | 1305670057984 |
| 17 | 2624225017856 |
| 18 | 404620279021568 |
| 19 | 467515780104192 |
| 20 | 1014849232437248 |
| 21 | 4446425022726144 |
| 22 | 5806013294837760 |
| 23 | 46545625738641408 |