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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 4 |
| 8 | -4 |
| 9 | 0 |
| 10 | 28 |
| 11 | -60 |
| 12 | 38 |
| 13 | 228 |
| 14 | -798 |
| 15 | 1036 |
| 16 | 1528 |
| 17 | -10064 |
| 18 | 20266 |
| 19 | -432 |
| 20 | -116414 |
| 21 | 342376 |
| 22 | -312232 |
| 23 | -1128944 |
| 24 | 5218867 |
| 25 | -8614080 |
| 26 | -6284630 |
| 27 | 71744552 |
| 28 | -175745087 |
| 29 | 80875672 |
| 30 | 855493548 |
| 31 | -3086044908 |
| 32 | 3923353016 |
| 33 | 7675455720 |
| 34 | -48219069200 |