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 | -1 |
| 4 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | -1 |
| 10 | -4 |
| 11 | 3 |
| 12 | 14 |
| 13 | -11 |
| 14 | -63 |
| 15 | 52 |
| 16 | 353 |
| 17 | -301 |
| 18 | -2356 |
| 19 | 2055 |
| 20 | 18194 |
| 21 | -16139 |
| 22 | -159335 |
| 23 | 143196 |
| 24 | 1559017 |
| 25 | -1415821 |
| 26 | -16846656 |
| 27 | 15430835 |
| 28 | 199185034 |
| 29 | -183754199 |
| 30 | -2557127951 |
| 31 | 2373373752 |
| 32 | 35416852081 |
| 33 | -33043478329 |
| 34 | -526322279512 |
| 35 | 493278801183 |
| 36 | 8352696141782 |