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 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | -5 |
| 8 | 7 |
| 9 | -2 |
| 10 | 1 |
| 11 | -9 |
| 12 | 27 |
| 13 | -30 |
| 14 | 9 |
| 15 | 1 |
| 16 | -14 |
| 17 | 72 |
| 18 | -165 |
| 19 | 159 |
| 20 | -44 |
| 21 | 1 |
| 22 | -20 |
| 23 | 156 |
| 24 | -597 |
| 25 | 1149 |
| 26 | -998 |
| 27 | 265 |
| 28 | 1 |
| 29 | -27 |
| 30 | 296 |
| 31 | -1689 |
| 32 | 5328 |
| 33 | -9041 |
| 34 | 7251 |
| 35 | -1854 |
| 36 | 1 |
| 37 | -35 |
| 38 | 512 |
| 39 | -4057 |
| 40 | 18840 |
| 41 | -51665 |
| 42 | 79579 |
| 43 | -59862 |
| 44 | 14833 |
| 45 | 1 |
| 46 | -44 |
| 47 | 827 |
| 48 | -8665 |
| 49 | 55353 |
| 50 | -221225 |
| 51 | 544564 |
| 52 | -776073 |
| 53 | 553591 |
| 54 | -133496 |