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 | -3 |
| 3 | -7 |
| 4 | 5 |
| 5 | 33 |
| 6 | 13 |
| 7 | -119 |
| 8 | -171 |
| 9 | 305 |
| 10 | 989 |
| 11 | -231 |
| 12 | -4187 |
| 13 | -3263 |
| 14 | 13485 |
| 15 | 26537 |
| 16 | -27403 |
| 17 | -133551 |
| 18 | -23939 |
| 19 | 510265 |
| 20 | 606021 |
| 21 | -1435039 |
| 22 | -3859123 |
| 23 | 1881033 |
| 24 | 17317525 |
| 25 | 9793393 |
| 26 | -59476707 |
| 27 | -98650279 |
| 28 | 139256549 |
| 29 | 533857665 |
| 30 | -23168531 |
| 31 | -2158599191 |
| 32 | -2065925067 |