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 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | -4 |
| 8 | 5 |
| 9 | -2 |
| 10 | 1 |
| 11 | -8 |
| 12 | 22 |
| 13 | -24 |
| 14 | 9 |
| 15 | 1 |
| 16 | -16 |
| 17 | 93 |
| 18 | -238 |
| 19 | 256 |
| 20 | -96 |
| 21 | 1 |
| 22 | -32 |
| 23 | 386 |
| 24 | -2180 |
| 25 | 5825 |
| 26 | -6500 |
| 27 | 2500 |
| 28 | 1 |
| 29 | -64 |
| 30 | 1586 |
| 31 | -19184 |
| 32 | 117561 |
| 33 | -345600 |
| 34 | 407700 |
| 35 | -162000 |
| 36 | 1 |
| 37 | -128 |
| 38 | 6476 |
| 39 | -164864 |
| 40 | 2229206 |
| 41 | -15585920 |
| 42 | 51583084 |
| 43 | -64538880 |
| 44 | 26471025 |