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 | -17 |
| 2 | 323 |
| 3 | -6783 |
| 4 | 155601 |
| 5 | -3861465 |
| 6 | 102864195 |
| 7 | -2922828615 |
| 8 | 88124295105 |
| 9 | -2806906632705 |
| 10 | 94095203991075 |
| 11 | -3309050756278575 |
| 12 | 121731738138774225 |
| 13 | -4672861215811814025 |
| 14 | 186756565415026882275 |
| 15 | -7755673484776330488375 |