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 | 28 |
| 2 | -1138 |
| 3 | -139496 |
| 4 | 2655820 |
| 5 | 1146808208 |
| 6 | 6588199624 |
| 7 | -13040522665184 |
| 8 | -453772272366448 |
| 9 | 187805452873608640 |
| 10 | 13107905447855859424 |
| 11 | -3242599451690793996928 |
| 12 | -367920121625910811856192 |
| 13 | 64485550348270970013174016 |
| 14 | 10998447568696594705407685760 |