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 | 5 |
| 2 | -15 |
| 3 | 29 |
| 4 | -23 |
| 5 | -43 |
| 6 | 225 |
| 7 | -499 |
| 8 | 601 |
| 9 | 197 |
| 10 | -2991 |
| 11 | 8189 |
| 12 | -12599 |
| 13 | 5045 |
| 14 | 35265 |
| 15 | -125971 |
| 16 | 236857 |
| 17 | -206683 |
| 18 | -327375 |
| 19 | 1808861 |
| 20 | -4117079 |
| 21 | 5115797 |
| 22 | 1120929 |
| 23 | -23825971 |
| 24 | 66994201 |
| 25 | -105678715 |
| 26 | 49059345 |
| 27 | 275536829 |
| 28 | -1022847863 |
| 29 | 1966396277 |
| 30 | -1807797375 |
| 31 | -2442192979 |
| 32 | 14557768441 |