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 | 1 |
| 2 | 0 |
| 3 | -2 |
| 4 | 7 |
| 5 | 259 |
| 6 | -28726 |
| 7 | -21126778 |
| 8 | 106100219840 |
| 9 | 4280272610298752 |
| 10 | -1553116380131413822408 |
| 11 | -5635994212344216419883091608 |
| 12 | 224970666556043231138664445792724812 |
| 13 | 107761317610991666102026987955237496031475980 |