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 | 0 |
| 1 | -1 |
| 2 | 2 |
| 3 | -1 |
| 4 | -2 |
| 5 | 5 |
| 6 | -4 |
| 7 | -3 |
| 8 | 12 |
| 9 | -13 |
| 10 | -2 |
| 11 | 27 |
| 12 | -38 |
| 13 | 9 |
| 14 | 56 |
| 15 | -103 |
| 16 | 56 |
| 17 | 103 |
| 18 | -262 |
| 19 | 215 |
| 20 | 150 |
| 21 | -627 |
| 22 | 692 |
| 23 | 85 |
| 24 | -1404 |
| 25 | 2011 |
| 26 | -522 |
| 27 | -2893 |
| 28 | 5426 |
| 29 | -3055 |
| 30 | -5264 |
| 31 | 13745 |
| 32 | -11536 |
| 33 | -7473 |
| 34 | 32754 |
| 35 | -36817 |
| 36 | -3410 |
| 37 | 72981 |
| 38 | -106388 |
| 39 | 29997 |
| 40 | 149372 |
| 41 | -285757 |
| 42 | 166382 |
| 43 | 268747 |
| 44 | -720886 |
| 45 | 618521 |
| 46 | 371112 |
| 47 | -1710519 |
| 48 | 1957928 |
| 49 | 123703 |
| 50 | -3792150 |