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 | 1 |
| 3 | 2 |
| 4 | -2 |
| 5 | 1 |
| 6 | -7 |
| 7 | 7 |
| 8 | -4 |
| 9 | 1 |
| 10 | 44 |
| 11 | -44 |
| 12 | 26 |
| 13 | -8 |
| 14 | 1 |
| 15 | -516 |
| 16 | 516 |
| 17 | -308 |
| 18 | 100 |
| 19 | -16 |
| 20 | 1 |
| 21 | 11622 |
| 22 | -11622 |
| 23 | 6959 |
| 24 | -2296 |
| 25 | 392 |
| 26 | -32 |
| 27 | 1 |
| 28 | -512022 |
| 29 | 512022 |
| 30 | -306888 |
| 31 | 101754 |
| 32 | -17712 |
| 33 | 1552 |
| 34 | -64 |
| 35 | 1 |
| 36 | 44588536 |
| 37 | -44588536 |
| 38 | 26732904 |
| 39 | -8877272 |
| 40 | 1554404 |
| 41 | -139104 |
| 42 | 6176 |
| 43 | -128 |
| 44 | 1 |