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 | 1 |
| 4 | -1 |
| 5 | -3 |
| 6 | -1 |
| 7 | -1 |
| 8 | -3 |
| 9 | 3 |
| 10 | -17 |
| 11 | -1 |
| 12 | -6 |
| 13 | 3 |
| 14 | -22 |
| 15 | 1 |
| 16 | -28 |
| 17 | 1 |
| 18 | -68 |
| 19 | 7 |
| 20 | -262 |
| 21 | -13 |
| 22 | -199 |
| 23 | 27 |
| 24 | -341 |
| 25 | 29 |
| 26 | -647 |
| 27 | 3 |
| 28 | -1431 |
| 29 | -25 |
| 30 | -476 |
| 31 | -81 |
| 32 | -4816 |
| 33 | 89 |
| 34 | -7384 |
| 35 | 637 |
| 36 | -17565 |
| 37 | -275 |
| 38 | -27043 |
| 39 | -263 |
| 40 | -107113 |
| 41 | -453 |
| 42 | -98469 |
| 43 | -583 |
| 44 | -208302 |
| 45 | 8121 |
| 46 | -371798 |
| 47 | -6661 |
| 48 | -743344 |
| 49 | 3045 |
| 50 | -1060666 |