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 | 0 |
| 3 | -3 |
| 4 | -7 |
| 5 | -6 |
| 6 | 11 |
| 7 | 49 |
| 8 | 78 |
| 9 | 3 |
| 10 | -297 |
| 11 | -750 |
| 12 | -691 |
| 13 | 1271 |
| 14 | 5970 |
| 15 | 9877 |
| 16 | 647 |
| 17 | -38640 |
| 18 | -100381 |
| 19 | -95689 |
| 20 | 170394 |
| 21 | 827453 |
| 22 | 1398933 |
| 23 | 131418 |
| 24 | -5472241 |
| 25 | -14495327 |
| 26 | -14186826 |
| 27 | 24241947 |
| 28 | 121177521 |
| 29 | 208360152 |
| 30 | 25541493 |
| 31 | -807963639 |
| 32 | -2175698844 |
| 33 | -2179521039 |