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 | 1 |
| 1 | -4 |
| 2 | -4 |
| 3 | 156 |
| 4 | 636 |
| 5 | -23844 |
| 6 | -213444 |
| 7 | 7561116 |
| 8 | 122079996 |
| 9 | -3999858084 |
| 10 | -105913993284 |
| 11 | 3121006139676 |
| 12 | 129328349560956 |
| 13 | -3294956189426724 |
| 14 | -210883838041123524 |
| 15 | 4369388083699591836 |
| 16 | 441597580986548139516 |