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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 8 |
| 5 | -11 |
| 6 | -6 |
| 7 | 1 |
| 8 | 38 |
| 9 | -108 |
| 10 | -242 |
| 11 | 839 |
| 12 | -444 |
| 13 | -180 |
| 14 | 1 |
| 15 | 144 |
| 16 | -425 |
| 17 | -7382 |
| 18 | 48451 |
| 19 | -96764 |
| 20 | -2559 |
| 21 | 257002 |
| 22 | -312444 |
| 23 | 88344 |
| 24 | 30240 |
| 25 | 1 |
| 26 | 487 |
| 27 | 720 |
| 28 | -130472 |
| 29 | 1277794 |
| 30 | -4193514 |
| 31 | -6504496 |