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 | -3 |
| 2 | 83 |
| 3 | -33 |
| 4 | -637 |
| 5 | 737 |
| 6 | 400901 |
| 7 | -77693 |
| 8 | -8068477 |
| 9 | 14020677 |
| 10 | 20212716433 |
| 11 | -3897112153 |
| 12 | -55894488728047 |
| 13 | 1539029451817 |
| 14 | 283145183503763 |
| 15 | -818543501023413 |
| 16 | -2926186778206833869 |
| 17 | 563942473703062157 |
| 18 | 17744532347627812073759 |
| 19 | -488536648399352355473 |