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 | -2 |
| 2 | 1 |
| 3 | 4 |
| 4 | -5 |
| 5 | 1 |
| 6 | -10 |
| 7 | 19 |
| 8 | -8 |
| 9 | 1 |
| 10 | 28 |
| 11 | -68 |
| 12 | 43 |
| 13 | -11 |
| 14 | 1 |
| 15 | -84 |
| 16 | 240 |
| 17 | -198 |
| 18 | 76 |
| 19 | -14 |
| 20 | 1 |
| 21 | 264 |
| 22 | -847 |
| 23 | 845 |
| 24 | -427 |
| 25 | 118 |
| 26 | -17 |
| 27 | 1 |
| 28 | -858 |
| 29 | 3003 |
| 30 | -3458 |
| 31 | 2140 |
| 32 | -782 |
| 33 | 169 |
| 34 | -20 |
| 35 | 1 |
| 36 | 2860 |
| 37 | -10712 |
| 38 | 13804 |
| 39 | -9996 |
| 40 | 4503 |
| 41 | -1290 |
| 42 | 229 |
| 43 | -23 |
| 44 | 1 |
| 45 | -9724 |
| 46 | 38454 |
| 47 | -54264 |
| 48 | 44574 |