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 | 0 |
| 3 | -3 |
| 4 | 3 |
| 5 | -5 |
| 6 | 8 |
| 7 | -10 |
| 8 | 22 |
| 9 | -25 |
| 10 | 41 |
| 11 | -57 |
| 12 | 88 |
| 13 | -126 |
| 14 | 168 |
| 15 | -261 |
| 16 | 351 |
| 17 | -512 |
| 18 | 685 |
| 19 | -984 |
| 20 | 1357 |
| 21 | -1865 |
| 22 | 2566 |
| 23 | -3485 |
| 24 | 4838 |
| 25 | -6459 |
| 26 | 8832 |
| 27 | -11831 |
| 28 | 16056 |
| 29 | -21404 |
| 30 | 28660 |
| 31 | -38259 |
| 32 | 50875 |
| 33 | -67613 |
| 34 | 89161 |
| 35 | -118184 |
| 36 | 155321 |
| 37 | -204609 |
| 38 | 267708 |
| 39 | -351125 |
| 40 | 458331 |
| 41 | -597740 |