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 | 1 |
| 3 | -3 |
| 4 | -2 |
| 5 | 1 |
| 6 | -16 |
| 7 | -16 |
| 8 | -2 |
| 9 | 1 |
| 10 | 0 |
| 11 | 100 |
| 12 | -10 |
| 13 | -10 |
| 14 | 1 |
| 15 | -1296 |
| 16 | 0 |
| 17 | 324 |
| 18 | -24 |
| 19 | -13 |
| 20 | 1 |
| 21 | 0 |
| 22 | 0 |
| 23 | 4116 |
| 24 | 392 |
| 25 | -175 |
| 26 | -14 |
| 27 | 1 |
| 28 | 0 |
| 29 | -131072 |
| 30 | 16384 |
| 31 | 12288 |
| 32 | -512 |
| 33 | -352 |
| 34 | -12 |
| 35 | 1 |
| 36 | 0 |
| 37 | 0 |
| 38 | -708588 |
| 39 | 0 |
| 40 | 44469 |
| 41 | 2592 |
| 42 | -459 |
| 43 | -24 |
| 44 | 1 |
| 45 | 0 |
| 46 | 0 |
| 47 | 16000000 |
| 48 | 800000 |
| 49 | -760000 |
| 50 | -12000 |
| 51 | 11000 |
| 52 | -100 |
| 53 | -45 |
| 54 | 1 |