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 | -142 |
| 3 | -6260 |
| 4 | 40492 |
| 5 | 6464600 |
| 6 | 15650680 |
| 7 | -9230092400 |
| 8 | -118813175920 |
| 9 | 16681327127200 |
| 10 | 425588368425760 |
| 11 | -36112927963566400 |
| 12 | -1494045516385037120 |
| 13 | 89931487642346454400 |
| 14 | 5599582070970791323520 |
| 15 | -248692059422561874272000 |
| 16 | -22813403511849591247097600 |