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 | 2 |
| 2 | -238 |
| 3 | -1444 |
| 4 | 169900 |
| 5 | 1737592 |
| 6 | -202103816 |
| 7 | -2927191216 |
| 8 | 336509481872 |
| 9 | 6340061157920 |
| 10 | -720237529201376 |
| 11 | -16783423060569152 |
| 12 | 1883705456612924608 |
| 13 | 52506471481118666624 |
| 14 | -5821124423542023483520 |
| 15 | -189534174225114089489152 |
| 16 | 20751613309007317066199296 |