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 | -5 |
| 2 | -126 |
| 3 | 3905 |
| 4 | 82530 |
| 5 | -2145125 |
| 6 | -132975486 |
| 7 | 19373108665 |
| 8 | 399220962210 |
| 9 | -18697127429075 |
| 10 | -1925850683171646 |
| 11 | 220480432805990435 |
| 12 | 13625538417469240290 |
| 13 | -921769705038763619225 |
| 14 | -132917180658162380887806 |
| 15 | 83001863806137706672499225 |
| 16 | 1709811776348530909197556770 |