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 | 0 |
| 2 | -1 |
| 3 | 1 |
| 4 | 2 |
| 5 | -4 |
| 6 | -3 |
| 7 | 15 |
| 8 | -1 |
| 9 | -51 |
| 10 | 42 |
| 11 | 154 |
| 12 | -274 |
| 13 | -372 |
| 14 | 1341 |
| 15 | 405 |
| 16 | -5599 |
| 17 | 2783 |
| 18 | 20295 |
| 19 | -27313 |
| 20 | -61139 |
| 21 | 160797 |
| 22 | 124462 |
| 23 | -767702 |
| 24 | 94964 |
| 25 | 3145986 |
| 26 | -2930086 |
| 27 | -10956466 |
| 28 | 21290868 |
| 29 | 29513156 |
| 30 | -114974111 |
| 31 | -33473459 |
| 32 | 522016279 |
| 33 | -279684579 |
| 34 | -2031228003 |
| 35 | 2867285041 |
| 36 | 6493289367 |
| 37 | -17791297065 |