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 | 1 |
| 4 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -11 |
| 8 | 27 |
| 9 | -1 |
| 10 | 1 |
| 11 | -17 |
| 12 | 84 |
| 13 | -97 |
| 14 | 1 |
| 15 | 1 |
| 16 | -23 |
| 17 | 177 |
| 18 | -497 |
| 19 | 311 |
| 20 | -1 |
| 21 | 1 |
| 22 | -29 |
| 23 | 306 |
| 24 | -1405 |
| 25 | 2546 |
| 26 | -925 |
| 27 | 1 |
| 28 | 1 |
| 29 | -35 |
| 30 | 471 |
| 31 | -3034 |
| 32 | 9375 |
| 33 | -11628 |
| 34 | 2628 |
| 35 | -1 |
| 36 | 1 |
| 37 | -41 |
| 38 | 672 |
| 39 | -5599 |
| 40 | 24817 |
| 41 | -55080 |
| 42 | 48875 |
| 43 | -7247 |
| 44 | 1 |
| 45 | 1 |
| 46 | -47 |
| 47 | 909 |
| 48 | -9316 |
| 49 | 54164 |