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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -2 |
| 6 | -4 |
| 7 | 3 |
| 8 | 13 |
| 9 | 0 |
| 10 | -36 |
| 11 | -23 |
| 12 | 85 |
| 13 | 118 |
| 14 | -160 |
| 15 | -429 |
| 16 | 169 |
| 17 | 1296 |
| 18 | 360 |
| 19 | -3359 |
| 20 | -3143 |
| 21 | 7294 |
| 22 | 13364 |
| 23 | -11661 |
| 24 | -44459 |
| 25 | 3888 |
| 26 | 125604 |
| 27 | 69481 |
| 28 | -303443 |
| 29 | -386282 |
| 30 | 593528 |
| 31 | 1448931 |
| 32 | -717935 |
| 33 | -4471200 |
| 34 | -868464 |
| 35 | 11827201 |
| 36 | 9961393 |
| 37 | -26388674 |
| 38 | -44445652 |
| 39 | 44681763 |