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 | -7 |
| 2 | 37 |
| 3 | -199 |
| 4 | 40321 |
| 5 | -5512813 |
| 6 | 136601407 |
| 7 | -32373535937 |
| 8 | 4039314145093 |
| 9 | -377880467185583 |
| 10 | 123905113265594071 |
| 11 | -53834048464836263969 |
| 12 | 66351862106782030159 |
| 13 | -194322297839115779164331 |
| 14 | 149128127842572749235559291 |
| 15 | -25454412383565669030714950177 |