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 | -14 |
| 2 | 91 |
| 3 | -378 |
| 4 | 1197 |
| 5 | -3290 |
| 6 | 8386 |
| 7 | -20008 |
| 8 | 44800 |
| 9 | -95578 |
| 10 | 196679 |
| 11 | -391692 |
| 12 | 756798 |
| 13 | -1424934 |
| 14 | 2624119 |
| 15 | -4735878 |
| 16 | 8388919 |
| 17 | -14611226 |
| 18 | 25065397 |
| 19 | -42400456 |
| 20 | 70790195 |
| 21 | -116765126 |
| 22 | 190454404 |
| 23 | -307408346 |
| 24 | 491306907 |