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 | 0 |
| 1 | -3 |
| 2 | -3 |
| 3 | -9 |
| 4 | -6 |
| 5 | -24 |
| 6 | -9 |
| 7 | -66 |
| 8 | -3 |
| 9 | -189 |
| 10 | 57 |
| 11 | -564 |
| 12 | 360 |
| 13 | -1749 |
| 14 | 1644 |
| 15 | -5607 |
| 16 | 6681 |
| 17 | -18465 |
| 18 | 25650 |
| 19 | -62076 |
| 20 | 95415 |
| 21 | -211878 |
| 22 | 348321 |
| 23 | -731049 |
| 24 | 1256841 |
| 25 | -2541468 |
| 26 | 4501572 |
| 27 | -8881245 |
| 28 | 16046184 |
| 29 | -31145307 |
| 30 | 57019797 |
| 31 | -109482105 |
| 32 | 202204698 |
| 33 | -385466112 |
| 34 | 716096199 |