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 | -3 |
| 5 | 1 |
| 6 | -9 |
| 7 | 15 |
| 8 | -7 |
| 9 | 1 |
| 10 | 94 |
| 11 | -160 |
| 12 | 80 |
| 13 | -15 |
| 14 | 1 |
| 15 | -2220 |
| 16 | 3790 |
| 17 | -1915 |
| 18 | 375 |
| 19 | -31 |
| 20 | 1 |
| 21 | 114456 |
| 22 | -195461 |
| 23 | 98875 |
| 24 | -19460 |
| 25 | 1652 |
| 26 | -63 |
| 27 | 1 |
| 28 | -12542341 |
| 29 | 21419587 |
| 30 | -10836231 |
| 31 | 2133635 |
| 32 | -181559 |
| 33 | 7035 |
| 34 | -127 |
| 35 | 1 |
| 36 | 2868686486 |
| 37 | -4899099640 |
| 38 | 2478483560 |
| 39 | -488022556 |
| 40 | 41534164 |
| 41 | -1611120 |
| 42 | 29360 |
| 43 | -255 |
| 44 | 1 |