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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | -3 |
| 6 | 6 |
| 7 | -4 |
| 8 | 1 |
| 9 | 0 |
| 10 | -64 |
| 11 | 154 |
| 12 | -137 |
| 13 | 58 |
| 14 | -12 |
| 15 | 1 |
| 16 | 0 |
| 17 | -2790 |
| 18 | 7467 |
| 19 | -7852 |
| 20 | 4300 |
| 21 | -1346 |
| 22 | 244 |
| 23 | -24 |
| 24 | 1 |
| 25 | 0 |
| 26 | -205056 |
| 27 | 593016 |
| 28 | -698250 |
| 29 | 448015 |
| 30 | -175004 |
| 31 | 43608 |
| 32 | -6990 |
| 33 | 700 |
| 34 | -40 |
| 35 | 1 |
| 36 | 0 |
| 37 | -22852200 |
| 38 | 70164670 |
| 39 | -89812001 |
| 40 | 64407806 |
| 41 | -29113410 |
| 42 | 8790285 |
| 43 | -1822164 |
| 44 | 260868 |
| 45 | -25405 |
| 46 | 1610 |
| 47 | -60 |
| 48 | 1 |