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 | 0 |
| 2 | -1 |
| 3 | 1 |
| 4 | -1 |
| 5 | -3 |
| 6 | 3 |
| 7 | 3 |
| 8 | -6 |
| 9 | 2 |
| 10 | 10 |
| 11 | -13 |
| 12 | -9 |
| 13 | 29 |
| 14 | -9 |
| 15 | -43 |
| 16 | 55 |
| 17 | 32 |
| 18 | -126 |
| 19 | 48 |
| 20 | 183 |
| 21 | -243 |
| 22 | -121 |
| 23 | 541 |
| 24 | -241 |
| 25 | -765 |
| 26 | 1082 |
| 27 | 450 |
| 28 | -2326 |
| 29 | 1171 |
| 30 | 3179 |
| 31 | -4803 |
| 32 | -1617 |
| 33 | 9993 |
| 34 | -5601 |
| 35 | -13168 |
| 36 | 21250 |
| 37 | 5552 |
| 38 | -42849 |
| 39 | 26489 |
| 40 | 54351 |
| 41 | -93763 |
| 42 | -17765 |
| 43 | 183347 |
| 44 | -124086 |
| 45 | -223422 |
| 46 | 412698 |
| 47 | 49827 |
| 48 | -782881 |
| 49 | 576541 |
| 50 | 914279 |