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 | -256 |
| 1 | 3072 |
| 2 | -19712 |
| 3 | 90112 |
| 4 | -329472 |
| 5 | 1025024 |
| 6 | -2818816 |
| 7 | 7028736 |
| 8 | -16180736 |
| 9 | 34850816 |
| 10 | -70946304 |
| 11 | 137592832 |
| 12 | -255836672 |
| 13 | 458422272 |
| 14 | -794962432 |
| 15 | 1338884096 |
| 16 | -2196606720 |
| 17 | 3519493120 |
| 18 | -5519205120 |
| 19 | 8487198720 |
| 20 | -12819206400 |
| 21 | 19045678080 |
| 22 | -27869287680 |