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 | 5 |
| 5 | -6 |
| 6 | 4 |
| 7 | -8 |
| 8 | 18 |
| 9 | -20 |
| 10 | 16 |
| 11 | -27 |
| 12 | 52 |
| 13 | -58 |
| 14 | 47 |
| 15 | -74 |
| 16 | 133 |
| 17 | -146 |
| 18 | 127 |
| 19 | -187 |
| 20 | 312 |
| 21 | -343 |
| 22 | 304 |
| 23 | -431 |
| 24 | 687 |
| 25 | -751 |
| 26 | 687 |
| 27 | -941 |
| 28 | 1436 |
| 29 | -1569 |
| 30 | 1459 |
| 31 | -1948 |
| 32 | 2879 |
| 33 | -3139 |
| 34 | 2975 |
| 35 | -3885 |
| 36 | 5569 |
| 37 | -6071 |
| 38 | 5826 |
| 39 | -7472 |
| 40 | 10457 |
| 41 | -11385 |
| 42 | 11067 |
| 43 | -13972 |
| 44 | 19122 |
| 45 | -20813 |
| 46 | 20423 |