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 | -5 |
| 3 | -10 |
| 4 | 4 |
| 5 | -26 |
| 6 | 50 |
| 7 | -50 |
| 8 | 0 |
| 9 | 9 |
| 10 | 130 |
| 11 | -122 |
| 12 | -40 |
| 13 | -170 |
| 14 | 250 |
| 15 | 260 |
| 16 | 0 |
| 17 | -290 |
| 18 | -45 |
| 19 | -362 |
| 20 | -104 |
| 21 | 500 |
| 22 | 610 |
| 23 | -530 |
| 24 | 0 |
| 25 | 25 |
| 26 | 850 |
| 27 | 0 |
| 28 | -200 |
| 29 | -842 |
| 30 | -1300 |
| 31 | -962 |
| 32 | 0 |
| 33 | 1220 |
| 34 | 1450 |
| 35 | 1300 |
| 36 | 36 |
| 37 | -1370 |
| 38 | 1810 |
| 39 | 1700 |
| 40 | 0 |
| 41 | -1682 |
| 42 | -2500 |
| 43 | -1850 |
| 44 | -488 |
| 45 | -234 |
| 46 | 2650 |
| 47 | -2210 |
| 48 | 0 |
| 49 | 49 |
| 50 | -125 |
| 51 | 2900 |
| 52 | -680 |