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 | -2 |
| 3 | -5 |
| 4 | 6 |
| 5 | 13 |
| 6 | -12 |
| 7 | -25 |
| 8 | 20 |
| 9 | 41 |
| 10 | -30 |
| 11 | -61 |
| 12 | 42 |
| 13 | 85 |
| 14 | -56 |
| 15 | -113 |
| 16 | 72 |
| 17 | 145 |
| 18 | -90 |
| 19 | -181 |
| 20 | 110 |
| 21 | 221 |
| 22 | -132 |
| 23 | -265 |
| 24 | 156 |
| 25 | 313 |
| 26 | -182 |
| 27 | -365 |
| 28 | 210 |
| 29 | 421 |
| 30 | -240 |
| 31 | -481 |
| 32 | 272 |
| 33 | 545 |
| 34 | -306 |
| 35 | -613 |
| 36 | 342 |
| 37 | 685 |
| 38 | -380 |
| 39 | -761 |
| 40 | 420 |
| 41 | 841 |
| 42 | -462 |
| 43 | -925 |
| 44 | 506 |
| 45 | 1013 |
| 46 | -552 |
| 47 | -1105 |
| 48 | 600 |
| 49 | 1201 |
| 50 | -650 |
| 51 | -1301 |
| 52 | 702 |
| 53 | 1405 |
| 54 | -756 |
| 55 | -1513 |