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 | -3 |
| 5 | -2 |
| 6 | 9 |
| 7 | -8 |
| 8 | -6 |
| 9 | 22 |
| 10 | -19 |
| 11 | -13 |
| 12 | 50 |
| 13 | -42 |
| 14 | -29 |
| 15 | 104 |
| 16 | -86 |
| 17 | -57 |
| 18 | 209 |
| 19 | -170 |
| 20 | -113 |
| 21 | 398 |
| 22 | -320 |
| 23 | -208 |
| 24 | 737 |
| 25 | -586 |
| 26 | -380 |
| 27 | 1320 |
| 28 | -1041 |
| 29 | -666 |
| 30 | 2311 |
| 31 | -1808 |
| 32 | -1152 |
| 33 | 3949 |
| 34 | -3069 |
| 35 | -1938 |
| 36 | 6629 |
| 37 | -5120 |
| 38 | -3221 |
| 39 | 10920 |
| 40 | -8390 |
| 41 | -5242 |
| 42 | 17724 |
| 43 | -13549 |
| 44 | -8435 |
| 45 | 28342 |