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 | 2 |
| 4 | 1 |
| 5 | 4 |
| 6 | -3 |
| 7 | 6 |
| 8 | -2 |
| 9 | -1 |
| 10 | -10 |
| 11 | 10 |
| 12 | -22 |
| 13 | 12 |
| 14 | -21 |
| 15 | -40 |
| 16 | -20 |
| 17 | 16 |
| 18 | -55 |
| 19 | 18 |
| 20 | -80 |
| 21 | -98 |
| 22 | -55 |
| 23 | 22 |
| 24 | -90 |
| 25 | -101 |
| 26 | -78 |
| 27 | -138 |
| 28 | -182 |
| 29 | 28 |
| 30 | -271 |
| 31 | 30 |
| 32 | -104 |
| 33 | -330 |
| 34 | -136 |
| 35 | -756 |
| 36 | -37 |
| 37 | 36 |
| 38 | -171 |
| 39 | -520 |
| 40 | -676 |
| 41 | 40 |
| 42 | -476 |
| 43 | 42 |
| 44 | -550 |
| 45 | -1786 |
| 46 | -253 |
| 47 | 46 |
| 48 | 648 |
| 49 | -1667 |
| 50 | -1276 |
| 51 | -1088 |
| 52 | -832 |
| 53 | 52 |
| 54 | 1539 |
| 55 | -4312 |