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 | -1 |
| 4 | 1 |
| 5 | 0 |
| 6 | -2 |
| 7 | 4 |
| 8 | -3 |
| 9 | -5 |
| 10 | 20 |
| 11 | -29 |
| 12 | 1 |
| 13 | 94 |
| 14 | -221 |
| 15 | 191 |
| 16 | 327 |
| 17 | -1454 |
| 18 | 2282 |
| 19 | -162 |
| 20 | -8002 |
| 21 | 19902 |
| 22 | -18275 |
| 23 | -30505 |
| 24 | 143511 |
| 25 | -234364 |
| 26 | 24437 |
| 27 | 841723 |
| 28 | -2164873 |
| 29 | 2069014 |
| 30 | 3325410 |
| 31 | -16315410 |
| 32 | 27375369 |
| 33 | -3714435 |
| 34 | -98829168 |
| 35 | 260605269 |
| 36 | -257026289 |
| 37 | -395719442 |