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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | -1 |
| 8 | 2 |
| 9 | -2 |
| 10 | 3 |
| 11 | -2 |
| 12 | 3 |
| 13 | -2 |
| 14 | 4 |
| 15 | -3 |
| 16 | 6 |
| 17 | -5 |
| 18 | 9 |
| 19 | -7 |
| 20 | 12 |
| 21 | -9 |
| 22 | 16 |
| 23 | -12 |
| 24 | 22 |
| 25 | -17 |
| 26 | 31 |
| 27 | -24 |
| 28 | 43 |
| 29 | -33 |
| 30 | 59 |
| 31 | -45 |
| 32 | 81 |
| 33 | -63 |
| 34 | 113 |
| 35 | -88 |
| 36 | 156 |
| 37 | -121 |
| 38 | 215 |
| 39 | -168 |
| 40 | 298 |
| 41 | -233 |
| 42 | 412 |
| 43 | -323 |
| 44 | 570 |
| 45 | -448 |
| 46 | 788 |
| 47 | -621 |
| 48 | 1090 |
| 49 | -861 |
| 50 | 1507 |
| 51 | -1193 |
| 52 | 2084 |
| 53 | -1654 |
| 54 | 2882 |
| 55 | -2293 |