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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | 8 |
| 7 | -14 |
| 8 | 16 |
| 9 | -7 |
| 10 | -24 |
| 11 | 103 |
| 12 | -232 |
| 13 | 334 |
| 14 | -256 |
| 15 | -211 |
| 16 | 1400 |
| 17 | -3562 |
| 18 | 6048 |
| 19 | -6470 |
| 20 | 512 |
| 21 | 17788 |
| 22 | -53720 |
| 23 | 102983 |
| 24 | -134832 |
| 25 | 76147 |
| 26 | 187960 |
| 27 | -776169 |
| 28 | 1690880 |
| 29 | -2558499 |
| 30 | 2270952 |
| 31 | 1214672 |
| 32 | -10443024 |
| 33 | 26674201 |
| 34 | -45822896 |
| 35 | 51953043 |
| 36 | -11147384 |
| 37 | -126256811 |
| 38 | 401311496 |