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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 1 |
| 6 | -1 |
| 7 | 3 |
| 8 | 3 |
| 9 | -1 |
| 10 | 0 |
| 11 | 2 |
| 12 | -6 |
| 13 | -4 |
| 14 | 1 |
| 15 | 0 |
| 16 | -8 |
| 17 | 8 |
| 18 | 20 |
| 19 | 5 |
| 20 | -1 |
| 21 | -16 |
| 22 | 14 |
| 23 | 58 |
| 24 | -4 |
| 25 | -31 |
| 26 | -6 |
| 27 | 1 |
| 28 | 48 |
| 29 | 16 |
| 30 | -169 |
| 31 | -121 |
| 32 | 69 |
| 33 | 63 |
| 34 | 7 |
| 35 | -1 |
| 36 | 208 |
| 37 | -320 |
| 38 | -576 |
| 39 | 540 |
| 40 | 432 |
| 41 | -128 |
| 42 | -97 |
| 43 | -8 |
| 44 | 1 |
| 45 | 400 |
| 46 | -2048 |
| 47 | 1876 |
| 48 | 2340 |
| 49 | -1828 |
| 50 | -928 |
| 51 | 309 |
| 52 | 153 |
| 53 | 9 |
| 54 | -1 |
| 55 | -4800 |
| 56 | 6880 |