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 | -10 |
| 2 | 135 |
| 3 | -2492 |
| 4 | 60605 |
| 5 | -1879038 |
| 6 | 72346915 |
| 7 | -3386587600 |
| 8 | 189409454649 |
| 9 | -12474273613490 |
| 10 | 955514574905471 |
| 11 | -84228064915705380 |
| 12 | 8465814535319723125 |
| 13 | -962413843819623611302 |
| 14 | 122866266360070054689435 |
| 15 | -17503231485467828809214648 |
| 16 | 2766579085410558809483880305 |