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 | 2 |
| 4 | -2 |
| 5 | 1 |
| 6 | -5 |
| 7 | 5 |
| 8 | -3 |
| 9 | 1 |
| 10 | 14 |
| 11 | -14 |
| 12 | 9 |
| 13 | -4 |
| 14 | 1 |
| 15 | -42 |
| 16 | 42 |
| 17 | -28 |
| 18 | 14 |
| 19 | -5 |
| 20 | 1 |
| 21 | 132 |
| 22 | -132 |
| 23 | 90 |
| 24 | -48 |
| 25 | 20 |
| 26 | -6 |
| 27 | 1 |
| 28 | -429 |
| 29 | 429 |
| 30 | -297 |
| 31 | 165 |
| 32 | -75 |
| 33 | 27 |
| 34 | -7 |
| 35 | 1 |
| 36 | 1430 |
| 37 | -1430 |
| 38 | 1001 |
| 39 | -572 |
| 40 | 275 |
| 41 | -110 |
| 42 | 35 |
| 43 | -8 |
| 44 | 1 |
| 45 | -4862 |
| 46 | 4862 |
| 47 | -3432 |
| 48 | 2002 |
| 49 | -1001 |
| 50 | 429 |
| 51 | -154 |
| 52 | 44 |
| 53 | -9 |
| 54 | 1 |