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 | -29 |
| 2 | 406 |
| 3 | -3683 |
| 4 | 24592 |
| 5 | -130558 |
| 6 | 582233 |
| 7 | -2273136 |
| 8 | 8008524 |
| 9 | -26002734 |
| 10 | 78934897 |
| 11 | -226364662 |
| 12 | 618201990 |
| 13 | -1618116248 |
| 14 | 4079918534 |
| 15 | -9950307189 |
| 16 | 23552872174 |
| 17 | -54265164588 |
| 18 | 121990316096 |
| 19 | -268139308160 |
| 20 | 577310455320 |
| 21 | -1219428331519 |
| 22 | 2530473842822 |
| 23 | -5165078293276 |
| 24 | 10381346324862 |