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 | 3 |
| 1 | -1 |
| 2 | -3 |
| 3 | 8 |
| 4 | -3 |
| 5 | -16 |
| 6 | 30 |
| 7 | -1 |
| 8 | -75 |
| 9 | 107 |
| 10 | 42 |
| 11 | -331 |
| 12 | 354 |
| 13 | 350 |
| 14 | -1389 |
| 15 | 1043 |
| 16 | 2085 |
| 17 | -5560 |
| 18 | 2433 |
| 19 | 10772 |
| 20 | -21198 |
| 21 | 2087 |
| 22 | 51081 |
| 23 | -76453 |
| 24 | -23622 |
| 25 | 227609 |
| 26 | -256818 |
| 27 | -222022 |
| 28 | 963267 |
| 29 | -776041 |
| 30 | -1372515 |
| 31 | 3887864 |
| 32 | -1918875 |
| 33 | -7229368 |
| 34 | 14954982 |
| 35 | -2415121 |
| 36 | -34724211 |
| 37 | 54509435 |
| 38 | 12523866 |