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 | 0 |
| 4 | -1 |
| 5 | 2 |
| 6 | -1 |
| 7 | -2 |
| 8 | 5 |
| 9 | -4 |
| 10 | -2 |
| 11 | 10 |
| 12 | -13 |
| 13 | 4 |
| 14 | 16 |
| 15 | -32 |
| 16 | 24 |
| 17 | 14 |
| 18 | -62 |
| 19 | 76 |
| 20 | -17 |
| 21 | -100 |
| 22 | 185 |
| 23 | -126 |
| 24 | -108 |
| 25 | 382 |
| 26 | -426 |
| 27 | 36 |
| 28 | 655 |
| 29 | -1098 |
| 30 | 650 |
| 31 | 798 |
| 32 | -2352 |
| 33 | 2402 |
| 34 | 115 |
| 35 | -4186 |
| 36 | 6441 |
| 37 | -3234 |
| 38 | -5612 |
| 39 | 14296 |
| 40 | -13307 |
| 41 | -2750 |
| 42 | 26556 |
| 43 | -37524 |
| 44 | 15220 |
| 45 | 38448 |
| 46 | -86366 |
| 47 | 72836 |
| 48 | 28545 |
| 49 | -166734 |
| 50 | 216788 |
| 51 | -65702 |
| 52 | -257380 |