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 | -2 |
| 3 | -23 |
| 4 | 586 |
| 5 | 48778 |
| 6 | -11759396 |
| 7 | -8596478231 |
| 8 | 18783386191762 |
| 9 | 123275424165263086 |
| 10 | -2426183754235085042972 |
| 11 | -143268577734839493464012630 |
| 12 | 25379312219817753259837452498340 |