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 | -1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -3 |
| 8 | 4 |
| 9 | -5 |
| 10 | 6 |
| 11 | -8 |
| 12 | 11 |
| 13 | -15 |
| 14 | 20 |
| 15 | -26 |
| 16 | 34 |
| 17 | -45 |
| 18 | 60 |
| 19 | -80 |
| 20 | 106 |
| 21 | -140 |
| 22 | 185 |
| 23 | -245 |
| 24 | 325 |
| 25 | -431 |
| 26 | 571 |
| 27 | -756 |
| 28 | 1001 |
| 29 | -1326 |
| 30 | 1757 |
| 31 | -2329 |
| 32 | 3086 |
| 33 | -4088 |
| 34 | 5415 |
| 35 | -7173 |
| 36 | 9504 |
| 37 | -12593 |
| 38 | 16685 |
| 39 | -22105 |
| 40 | 29284 |
| 41 | -38796 |
| 42 | 51400 |
| 43 | -68100 |
| 44 | 90225 |
| 45 | -119535 |
| 46 | 158365 |
| 47 | -209810 |
| 48 | 277970 |
| 49 | -368275 |
| 50 | 487916 |
| 51 | -646421 |
| 52 | 856416 |