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 | 2 |
| 3 | 4 |
| 4 | -7 |
| 5 | 5 |
| 6 | -7 |
| 7 | 32 |
| 8 | -35 |
| 9 | 15 |
| 10 | 37 |
| 11 | -131 |
| 12 | 228 |
| 13 | -171 |
| 14 | 52 |
| 15 | -94 |
| 16 | 646 |
| 17 | -1379 |
| 18 | 1540 |
| 19 | -864 |
| 20 | 203 |
| 21 | 587 |
| 22 | -3146 |
| 23 | 8648 |
| 24 | -12483 |
| 25 | 10308 |
| 26 | -4588 |
| 27 | 877 |
| 28 | -1925 |
| 29 | 17464 |
| 30 | -55125 |
| 31 | 98923 |
| 32 | -106834 |
| 33 | 69951 |
| 34 | -25717 |
| 35 | 4140 |
| 36 | 13606 |
| 37 | -98053 |
| 38 | 367914 |
| 39 | -781241 |
| 40 | 1044519 |
| 41 | -898394 |
| 42 | 486811 |
| 43 | -152169 |
| 44 | 21147 |