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 | 0 |
| 2 | -1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 2 |
| 6 | -1 |
| 7 | -2 |
| 8 | 5 |
| 9 | -4 |
| 10 | 1 |
| 11 | 0 |
| 12 | -7 |
| 13 | 18 |
| 14 | -9 |
| 15 | -12 |
| 16 | 17 |
| 17 | -24 |
| 18 | 31 |
| 19 | 6 |
| 20 | -67 |
| 21 | 94 |
| 22 | -49 |
| 23 | -60 |
| 24 | 157 |
| 25 | -230 |
| 26 | 217 |
| 27 | 118 |
| 28 | -619 |
| 29 | 758 |
| 30 | -461 |
| 31 | -252 |
| 32 | 1509 |
| 33 | -2490 |
| 34 | 1867 |
| 35 | 780 |
| 36 | -4531 |
| 37 | 6932 |
| 38 | -5543 |
| 39 | -820 |
| 40 | 11885 |
| 41 | -21248 |
| 42 | 17591 |
| 43 | 2586 |
| 44 | -32415 |
| 45 | 58070 |
| 46 | -54325 |
| 47 | -56 |