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 | -3 |
| 4 | -2 |
| 5 | -9 |
| 6 | 8 |
| 7 | -5 |
| 8 | 6 |
| 9 | -6 |
| 10 | 6 |
| 11 | -45 |
| 12 | -4 |
| 13 | -25 |
| 14 | -30 |
| 15 | -21 |
| 16 | -130 |
| 17 | -225 |
| 18 | -70 |
| 19 | -125 |
| 20 | -130 |
| 21 | -345 |
| 22 | -570 |
| 23 | -1125 |
| 24 | -480 |
| 25 | -544 |
| 26 | -1150 |
| 27 | -1812 |
| 28 | -3550 |
| 29 | -5625 |
| 30 | 222 |
| 31 | -7 |
| 32 | 530 |
| 33 | 249 |
| 34 | 858 |
| 35 | 27 |
| 36 | 418 |
| 37 | -35 |
| 38 | 430 |
| 39 | 45 |
| 40 | 610 |
| 41 | -315 |
| 42 | 1520 |
| 43 | -175 |
| 44 | 2650 |
| 45 | -48 |
| 46 | 3450 |
| 47 | -1575 |
| 48 | 2060 |
| 49 | -850 |
| 50 | 804 |
| 51 | -1275 |
| 52 | -250 |
| 53 | -7875 |
| 54 | 4288 |
| 55 | -3565 |
| 56 | 6150 |
| 57 | -12375 |