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 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 0 |
| 7 | -3 |
| 8 | -3 |
| 9 | 1 |
| 10 | 9 |
| 11 | 1 |
| 12 | -9 |
| 13 | -9 |
| 14 | 3 |
| 15 | 22 |
| 16 | 3 |
| 17 | -22 |
| 18 | -22 |
| 19 | 9 |
| 20 | 51 |
| 21 | 8 |
| 22 | -51 |
| 23 | -51 |
| 24 | 21 |
| 25 | 108 |
| 26 | 19 |
| 27 | -108 |
| 28 | -108 |
| 29 | 48 |
| 30 | 221 |
| 31 | 42 |
| 32 | -221 |
| 33 | -221 |
| 34 | 99 |
| 35 | 429 |
| 36 | 86 |
| 37 | -429 |
| 38 | -428 |
| 39 | 199 |
| 40 | 810 |
| 41 | 170 |
| 42 | -809 |
| 43 | -807 |
| 44 | 378 |
| 45 | 1479 |
| 46 | 321 |
| 47 | -1476 |
| 48 | -1470 |
| 49 | 702 |
| 50 | 2640 |
| 51 | 589 |
| 52 | -2631 |
| 53 | -2618 |
| 54 | 1258 |
| 55 | 4599 |
| 56 | 1050 |
| 57 | -4577 |
| 58 | -4548 |
| 59 | 2211 |