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 | 9 |
| 2 | -6 |
| 3 | 1 |
| 4 | 25 |
| 5 | -50 |
| 6 | 35 |
| 7 | -10 |
| 8 | 1 |
| 9 | 49 |
| 10 | -196 |
| 11 | 294 |
| 12 | -210 |
| 13 | 77 |
| 14 | -14 |
| 15 | 1 |
| 16 | 81 |
| 17 | -540 |
| 18 | 1386 |
| 19 | -1782 |
| 20 | 1287 |
| 21 | -546 |
| 22 | 135 |
| 23 | -18 |
| 24 | 1 |
| 25 | 121 |
| 26 | -1210 |
| 27 | 4719 |
| 28 | -9438 |
| 29 | 11011 |
| 30 | -8008 |
| 31 | 3740 |
| 32 | -1122 |
| 33 | 209 |
| 34 | -22 |
| 35 | 1 |
| 36 | 169 |
| 37 | -2366 |
| 38 | 13013 |
| 39 | -37180 |
| 40 | 63206 |
| 41 | -68952 |
| 42 | 50388 |
| 43 | -25194 |
| 44 | 8645 |
| 45 | -2002 |
| 46 | 299 |
| 47 | -26 |
| 48 | 1 |