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 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | -2 |
| 4 | 0 |
| 5 | 1 |
| 6 | 6 |
| 7 | 4 |
| 8 | -2 |
| 9 | -1 |
| 10 | 0 |
| 11 | -12 |
| 12 | -5 |
| 13 | 3 |
| 14 | 1 |
| 15 | 0 |
| 16 | 60 |
| 17 | 49 |
| 18 | -3 |
| 19 | -7 |
| 20 | -1 |
| 21 | 0 |
| 22 | 360 |
| 23 | 84 |
| 24 | -90 |
| 25 | -19 |
| 26 | 5 |
| 27 | 1 |
| 28 | 0 |
| 29 | -2520 |
| 30 | -1308 |
| 31 | 414 |
| 32 | 241 |
| 33 | -5 |
| 34 | -11 |
| 35 | -1 |
| 36 | 0 |
| 37 | 0 |
| 38 | 3780 |
| 39 | 1752 |
| 40 | -590 |
| 41 | -290 |
| 42 | 9 |
| 43 | 12 |
| 44 | 1 |
| 45 | 0 |
| 46 | 0 |
| 47 | 0 |
| 48 | -7560 |
| 49 | -2874 |
| 50 | 1122 |
| 51 | 406 |
| 52 | -19 |
| 53 | -14 |
| 54 | -1 |