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 | 0 |
| 2 | -2 |
| 3 | -3 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 0 |
| 8 | 9 |
| 9 | 8 |
| 10 | 4 |
| 11 | -31 |
| 12 | -12 |
| 13 | -13 |
| 14 | 20 |
| 15 | -13 |
| 16 | 48 |
| 17 | -17 |
| 18 | 74 |
| 19 | -87 |
| 20 | 8 |
| 21 | -143 |
| 22 | 175 |
| 23 | -174 |
| 24 | 349 |
| 25 | -164 |
| 26 | 369 |
| 27 | -651 |
| 28 | 520 |
| 29 | -1004 |
| 30 | 1142 |
| 31 | -1218 |
| 32 | 1652 |
| 33 | -1739 |
| 34 | 3291 |
| 35 | -3933 |
| 36 | 3546 |
| 37 | -5743 |
| 38 | 6170 |
| 39 | -8022 |
| 40 | 11435 |
| 41 | -13230 |
| 42 | 17196 |
| 43 | -18706 |
| 44 | 22958 |
| 45 | -31884 |
| 46 | 38420 |
| 47 | -49802 |
| 48 | 58916 |