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 | -7 |
| 3 | -12 |
| 4 | 31 |
| 5 | 193 |
| 6 | 240 |
| 7 | -1105 |
| 8 | -5167 |
| 9 | -3924 |
| 10 | 36343 |
| 11 | 133873 |
| 12 | 31584 |
| 13 | -1131025 |
| 14 | -3343639 |
| 15 | 1240212 |
| 16 | 33732367 |
| 17 | 79895089 |
| 18 | -90574128 |
| 19 | -970716385 |
| 20 | -1800454975 |
| 21 | 3954181452 |
| 22 | 27045519079 |
| 23 | 37164094177 |
| 24 | -145299908928 |
| 25 | -730358292769 |
| 26 | -653629025575 |
| 27 | 4869632030004 |