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 | -3 |
| 2 | 1 |
| 3 | 10 |
| 4 | -5 |
| 5 | 1 |
| 6 | -35 |
| 7 | 21 |
| 8 | -7 |
| 9 | 1 |
| 10 | 126 |
| 11 | -84 |
| 12 | 36 |
| 13 | -9 |
| 14 | 1 |
| 15 | -462 |
| 16 | 330 |
| 17 | -165 |
| 18 | 55 |
| 19 | -11 |
| 20 | 1 |
| 21 | 1716 |
| 22 | -1287 |
| 23 | 715 |
| 24 | -286 |
| 25 | 78 |
| 26 | -13 |
| 27 | 1 |
| 28 | -6435 |
| 29 | 5005 |
| 30 | -3003 |
| 31 | 1365 |
| 32 | -455 |
| 33 | 105 |
| 34 | -15 |
| 35 | 1 |
| 36 | 24310 |
| 37 | -19448 |
| 38 | 12376 |
| 39 | -6188 |
| 40 | 2380 |
| 41 | -680 |
| 42 | 136 |
| 43 | -17 |
| 44 | 1 |
| 45 | -92378 |
| 46 | 75582 |
| 47 | -50388 |
| 48 | 27132 |
| 49 | -11628 |
| 50 | 3876 |
| 51 | -969 |
| 52 | 171 |
| 53 | -19 |
| 54 | 1 |
| 55 | 352716 |
| 56 | -293930 |
| 57 | 203490 |