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 | -1 |
| 2 | -1 |
| 3 | 4 |
| 4 | 1 |
| 5 | -17 |
| 6 | -6 |
| 7 | 118 |
| 8 | -8 |
| 9 | -876 |
| 10 | 625 |
| 11 | 5966 |
| 12 | -7486 |
| 13 | -41937 |
| 14 | 75969 |
| 15 | 306312 |
| 16 | -768637 |
| 17 | -2164992 |
| 18 | 7487063 |
| 19 | 14461466 |
| 20 | -70259884 |
| 21 | -89410774 |
| 22 | 646971980 |
| 23 | 459817892 |
| 24 | -5861484630 |
| 25 | -1128608133 |
| 26 | 52082250637 |
| 27 | -15894742662 |
| 28 | -453574650852 |
| 29 | 366848121166 |
| 30 | 3866670213663 |
| 31 | -5215687717614 |