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 | -3 |
| 4 | -3 |
| 5 | 1 |
| 6 | -17 |
| 7 | -3 |
| 8 | -6 |
| 9 | 1 |
| 10 | -160 |
| 11 | -25 |
| 12 | 5 |
| 13 | -10 |
| 14 | 1 |
| 15 | -2088 |
| 16 | -285 |
| 17 | -35 |
| 18 | 30 |
| 19 | -15 |
| 20 | 1 |
| 21 | -34307 |
| 22 | -4179 |
| 23 | -420 |
| 24 | -91 |
| 25 | 84 |
| 26 | -21 |
| 27 | 1 |
| 28 | -675091 |
| 29 | -74823 |
| 30 | -6916 |
| 31 | -497 |
| 32 | -322 |
| 33 | 182 |
| 34 | -28 |
| 35 | 1 |
| 36 | -15428619 |
| 37 | -1577763 |
| 38 | -135639 |
| 39 | -10080 |
| 40 | -63 |
| 41 | -1002 |
| 42 | 342 |
| 43 | -36 |
| 44 | 1 |
| 45 | -400928675 |
| 46 | -38209725 |
| 47 | -3082905 |
| 48 | -215700 |
| 49 | -14139 |
| 50 | 2655 |
| 51 | -2625 |