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 | 0 |
| 2 | -1 |
| 3 | 2 |
| 4 | 5 |
| 5 | -8 |
| 6 | 3 |
| 7 | 8 |
| 8 | 141 |
| 9 | -204 |
| 10 | 11 |
| 11 | -4 |
| 12 | -11 |
| 13 | -30 |
| 14 | 99 |
| 15 | 1836 |
| 16 | 164997 |
| 17 | -224532 |
| 18 | 2403 |
| 19 | -126 |
| 20 | -39 |
| 21 | 14 |
| 22 | -5 |
| 23 | -14 |
| 24 | -267 |
| 25 | -738 |
| 26 | 351 |
| 27 | -1134 |
| 28 | -28431 |
| 29 | -538002 |
| 30 | 9537507 |
| 31 | 891167508 |
| 32 | 361226647845 |
| 33 | -471103550820 |
| 34 | 1127461923 |
| 35 | -11787930 |
| 36 | -675783 |
| 37 | 34992 |
| 38 | -1377 |
| 39 | -432 |
| 40 | -927 |