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 | -6 |
| 5 | -5 |
| 6 | 11 |
| 7 | 37 |
| 8 | 59 |
| 9 | 13 |
| 10 | -155 |
| 11 | -402 |
| 12 | -415 |
| 13 | 263 |
| 14 | 1981 |
| 15 | 3748 |
| 16 | 2289 |
| 17 | -6643 |
| 18 | -22642 |
| 19 | -31322 |
| 20 | -187 |
| 21 | 99040 |
| 22 | 229410 |
| 23 | 216823 |
| 24 | -230029 |
| 25 | -1223267 |
| 26 | -2097812 |
| 27 | -955237 |
| 28 | 4468902 |
| 29 | 13393758 |
| 30 | 16752461 |
| 31 | -3891704 |
| 32 | -62382597 |
| 33 | -131974181 |
| 34 | -106680562 |
| 35 | 173622424 |
| 36 | 741553622 |
| 37 | 1163057561 |
| 38 | 329176545 |