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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 2 |
| 6 | -1 |
| 7 | -5 |
| 8 | 7 |
| 9 | 13 |
| 10 | -37 |
| 11 | -27 |
| 12 | 175 |
| 13 | -2 |
| 14 | -768 |
| 15 | 521 |
| 16 | 3120 |
| 17 | -4457 |
| 18 | -11394 |
| 19 | 28363 |
| 20 | 34269 |
| 21 | -157108 |
| 22 | -56124 |
| 23 | 790091 |
| 24 | -270661 |
| 25 | -3638871 |
| 26 | 3821242 |
| 27 | 15153860 |
| 28 | -29235087 |
| 29 | -54470264 |
| 30 | 182441139 |
| 31 | 143800906 |
| 32 | -1008933847 |
| 33 | -16080652 |
| 34 | 5067562024 |
| 35 | -3456404771 |
| 36 | -23114068193 |
| 37 | 33623924709 |
| 38 | 93441615451 |