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 | -2 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | -8 |
| 8 | -7 |
| 9 | -6 |
| 10 | 27 |
| 11 | -54 |
| 12 | 57 |
| 13 | -56 |
| 14 | -233 |
| 15 | -232 |
| 16 | -7 |
| 17 | -6 |
| 18 | 187 |
| 19 | -588 |
| 20 | 1485 |
| 21 | -1242 |
| 22 | -6177 |
| 23 | -3184 |
| 24 | -639 |
| 25 | 640 |
| 26 | -1441 |
| 27 | -3472 |
| 28 | 13033 |
| 29 | 13032 |
| 30 | -20745 |
| 31 | -24120 |
| 32 | 1593 |
| 33 | 1594 |
| 34 | 20891 |
| 35 | -60476 |
| 36 | 9069 |
| 37 | -26964 |
| 38 | -1916541 |
| 39 | -6305202 |
| 40 | 1619109 |
| 41 | -1599426 |
| 42 | -8587701 |