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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | -1 |
| 9 | -2 |
| 10 | -3 |
| 11 | -4 |
| 12 | -4 |
| 13 | -4 |
| 14 | -4 |
| 15 | -4 |
| 16 | -3 |
| 17 | -1 |
| 18 | 2 |
| 19 | 6 |
| 20 | 10 |
| 21 | 14 |
| 22 | 18 |
| 23 | 22 |
| 24 | 25 |
| 25 | 26 |
| 26 | 24 |
| 27 | 18 |
| 28 | 8 |
| 29 | -6 |
| 30 | -24 |
| 31 | -46 |
| 32 | -71 |
| 33 | -97 |
| 34 | -121 |
| 35 | -139 |
| 36 | -147 |
| 37 | -141 |
| 38 | -117 |
| 39 | -71 |
| 40 | 0 |
| 41 | 97 |
| 42 | 218 |
| 43 | 357 |
| 44 | 504 |
| 45 | 645 |
| 46 | 762 |
| 47 | 833 |
| 48 | 833 |
| 49 | 736 |
| 50 | 518 |
| 51 | 161 |
| 52 | -343 |
| 53 | -988 |
| 54 | -1750 |
| 55 | -2583 |
| 56 | -3416 |
| 57 | -4152 |