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 | 2 |
| 3 | 4 |
| 4 | 4 |
| 5 | 11 |
| 6 | -3 |
| 7 | 36 |
| 8 | -46 |
| 9 | 133 |
| 10 | -213 |
| 11 | 419 |
| 12 | -586 |
| 13 | 716 |
| 14 | -199 |
| 15 | -1807 |
| 16 | 7570 |
| 17 | -20637 |
| 18 | 47563 |
| 19 | -97849 |
| 20 | 185438 |
| 21 | -326192 |
| 22 | 531721 |
| 23 | -785058 |
| 24 | 980926 |
| 25 | -780084 |
| 26 | -700944 |
| 27 | 5511613 |
| 28 | -18000159 |
| 29 | 46704269 |
| 30 | -107137804 |
| 31 | 225187101 |
| 32 | -439627178 |
| 33 | 799622938 |
| 34 | -1347732434 |
| 35 | 2069035230 |