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 | 0 |
| 3 | -3 |
| 4 | -5 |
| 5 | -2 |
| 6 | 9 |
| 7 | 21 |
| 8 | 16 |
| 9 | -23 |
| 10 | -81 |
| 11 | -90 |
| 12 | 37 |
| 13 | 289 |
| 14 | 432 |
| 15 | 69 |
| 16 | -941 |
| 17 | -1874 |
| 18 | -1071 |
| 19 | 2685 |
| 20 | 7504 |
| 21 | 6961 |
| 22 | -5913 |
| 23 | -27882 |
| 24 | -35891 |
| 25 | 3817 |
| 26 | 95472 |
| 27 | 163437 |
| 28 | 60331 |
| 29 | -294050 |
| 30 | -681255 |
| 31 | -507867 |
| 32 | 761488 |
| 33 | 2631865 |
| 34 | 2886111 |
| 35 | -1268730 |
| 36 | -9418571 |
| 37 | -13922063 |
| 38 | -1966032 |
| 39 | 30793173 |
| 40 | 60603331 |
| 41 | 33742222 |
| 42 | -88447455 |