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 | 506855279 |
| 13 | 84930743344 |
| 14 | 7601322881752 |
| 15 | 482475325333252 |
| 16 | 24347701836204379 |
| 17 | 1038820801135250668 |
| 18 | 38928478953655850016 |
| 19 | 1314623638623845390906 |
| 20 | 40749347642026348171659 |