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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 0 |
| 4 | -3 |
| 5 | 3 |
| 6 | -5 |
| 7 | 5 |
| 8 | -12 |
| 9 | 8 |
| 10 | -12 |
| 11 | 16 |
| 12 | -31 |
| 13 | 31 |
| 14 | -55 |
| 15 | 23 |
| 16 | -99 |
| 17 | 131 |
| 18 | -184 |
| 19 | 184 |
| 20 | -389 |
| 21 | 157 |
| 22 | -528 |
| 23 | 760 |
| 24 | -1171 |
| 25 | 800 |
| 26 | -2058 |
| 27 | 1235 |
| 28 | -3248 |
| 29 | 4442 |
| 30 | -5566 |
| 31 | 5566 |
| 32 | -13461 |
| 33 | 7433 |
| 34 | -20534 |
| 35 | 18290 |
| 36 | -30439 |
| 37 | 38711 |
| 38 | -77429 |
| 39 | 46895 |
| 40 | -105973 |
| 41 | 136507 |
| 42 | -187059 |
| 43 | 187059 |
| 44 | -441337 |
| 45 | 185384 |
| 46 | -632122 |
| 47 | 888075 |