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) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | 3 |
| 4 | -2 |
| 5 | 1 |
| 6 | -11 |
| 7 | 9 |
| 8 | -3 |
| 9 | 1 |
| 10 | 57 |
| 11 | -44 |
| 12 | 18 |
| 13 | -4 |
| 14 | 1 |
| 15 | -361 |
| 16 | 285 |
| 17 | -110 |
| 18 | 30 |
| 19 | -5 |
| 20 | 1 |
| 21 | 2763 |
| 22 | -2166 |
| 23 | 855 |
| 24 | -220 |
| 25 | 45 |
| 26 | -6 |
| 27 | 1 |
| 28 | -24611 |
| 29 | 19341 |
| 30 | -7581 |
| 31 | 1995 |
| 32 | -385 |
| 33 | 63 |
| 34 | -7 |
| 35 | 1 |
| 36 | 250737 |
| 37 | -196888 |
| 38 | 77364 |
| 39 | -20216 |
| 40 | 3990 |
| 41 | -616 |
| 42 | 84 |
| 43 | -8 |
| 44 | 1 |
| 45 | -2873041 |
| 46 | 2256633 |
| 47 | -885996 |
| 48 | 232092 |
| 49 | -45486 |
| 50 | 7182 |
| 51 | -924 |
| 52 | 108 |
| 53 | -9 |
| 54 | 1 |