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