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 | 5 |
| 1 | -1 |
| 2 | 9 |
| 3 | -4 |
| 4 | 25 |
| 5 | -16 |
| 6 | 78 |
| 7 | -64 |
| 8 | 257 |
| 9 | -256 |
| 10 | 874 |
| 11 | -1013 |
| 12 | 3034 |
| 13 | -3953 |
| 14 | 10684 |
| 15 | -15229 |
| 16 | 38017 |
| 17 | -58056 |
| 18 | 136338 |
| 19 | -219508 |
| 20 | 491870 |
| 21 | -824737 |
| 22 | 1782735 |
| 23 | -3083887 |
| 24 | 6484514 |
| 25 | -11489516 |
| 26 | 23652443 |
| 27 | -42688039 |
| 28 | 86459608 |
| 29 | -158270401 |
| 30 | 316576903 |
| 31 | -585868009 |
| 32 | 1160673633 |