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 | 3 |
| 4 | -5 |
| 5 | 35 |
| 6 | -21 |
| 7 | 51 |
| 8 | 187 |
| 9 | -253 |
| 10 | 1035 |
| 11 | -45 |
| 12 | 91 |
| 13 | 8099 |
| 14 | -8277 |
| 15 | 25203 |
| 16 | 23035 |
| 17 | -38845 |
| 18 | 286539 |
| 19 | -179949 |
| 20 | 442267 |
| 21 | 1490147 |
| 22 | -2045205 |
| 23 | 8563635 |
| 24 | -732869 |
| 25 | 1498499 |
| 26 | 65544843 |
| 27 | -68410797 |
| 28 | 211488475 |
| 29 | 176048675 |
| 30 | -300358101 |
| 31 | 2344363251 |
| 32 | -1536690053 |
| 33 | 3822551747 |
| 34 | 11858974155 |