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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 4245504 |
| 13 | 290787328 |
| 14 | 11134212096 |
| 15 | 315250053120 |
| 16 | 7373732315136 |
| 17 | 151048265662464 |
| 18 | 2807359026757632 |
| 19 | 48456016702472192 |
| 20 | 789426139189739520 |
| 21 | 12282937010848530432 |
| 22 | 184138764390344687616 |
| 23 | 2677761622120892203008 |