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 | 2 |
| 4 | -3 |
| 5 | 1 |
| 6 | -7 |
| 7 | 12 |
| 8 | -6 |
| 9 | 1 |
| 10 | 37 |
| 11 | -67 |
| 12 | 39 |
| 13 | -10 |
| 14 | 1 |
| 15 | -266 |
| 16 | 495 |
| 17 | -310 |
| 18 | 95 |
| 19 | -15 |
| 20 | 1 |
| 21 | 2431 |
| 22 | -4596 |
| 23 | 3000 |
| 24 | -1010 |
| 25 | 195 |
| 26 | -21 |
| 27 | 1 |
| 28 | -27007 |
| 29 | 51583 |
| 30 | -34566 |
| 31 | 12320 |
| 32 | -2660 |
| 33 | 357 |
| 34 | -28 |
| 35 | 1 |
| 36 | 353522 |
| 37 | -680037 |
| 38 | 463981 |
| 39 | -171766 |
| 40 | 39795 |
| 41 | -6062 |
| 42 | 602 |
| 43 | -36 |
| 44 | 1 |
| 45 | -5329837 |
| 46 | 10306152 |
| 47 | -7124454 |
| 48 | 2709525 |
| 49 | -658791 |
| 50 | 108927 |
| 51 | -12432 |
| 52 | 954 |