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 | 0 |
| 4 | -5 |
| 5 | 1 |
| 6 | -12 |
| 7 | 4 |
| 8 | -8 |
| 9 | 1 |
| 10 | -129 |
| 11 | -22 |
| 12 | 18 |
| 13 | -12 |
| 14 | 1 |
| 15 | -1785 |
| 16 | -238 |
| 17 | -51 |
| 18 | 51 |
| 19 | -17 |
| 20 | 1 |
| 21 | -30291 |
| 22 | -3634 |
| 23 | -345 |
| 24 | -161 |
| 25 | 115 |
| 26 | -23 |
| 27 | 1 |
| 28 | -608565 |
| 29 | -66750 |
| 30 | -6111 |
| 31 | -285 |
| 32 | -505 |
| 33 | 225 |
| 34 | -30 |
| 35 | 1 |
| 36 | -14112744 |
| 37 | -1432296 |
| 38 | -122227 |
| 39 | -9177 |
| 40 | 665 |
| 41 | -1387 |
| 42 | 399 |
| 43 | -38 |
| 44 | 1 |
| 45 | -370746528 |
| 46 | -35129022 |
| 47 | -2818543 |
| 48 | -196037 |
| 49 | -14335 |
| 50 | 4841 |
| 51 | -3337 |
| 52 | 658 |