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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -4 |
| 6 | 1 |
| 7 | 1 |
| 8 | -15 |
| 9 | 5 |
| 10 | -1 |
| 11 | 1 |
| 12 | -58 |
| 13 | 10 |
| 14 | -6 |
| 15 | 1 |
| 16 | 1 |
| 17 | -229 |
| 18 | -66 |
| 19 | -26 |
| 20 | 7 |
| 21 | -1 |
| 22 | 1 |
| 23 | -912 |
| 24 | -1017 |
| 25 | -288 |
| 26 | 23 |
| 27 | -8 |
| 28 | 1 |
| 29 | 1 |
| 30 | -3643 |
| 31 | -8733 |
| 32 | -4779 |
| 33 | -415 |
| 34 | -41 |
| 35 | 9 |
| 36 | -1 |
| 37 | 1 |
| 38 | -14566 |
| 39 | -61880 |
| 40 | -63606 |
| 41 | -17242 |
| 42 | -1158 |
| 43 | 40 |
| 44 | -10 |
| 45 | 1 |
| 46 | 1 |
| 47 | -58257 |
| 48 | -396796 |
| 49 | -691036 |
| 50 | -375118 |
| 51 | -60990 |
| 52 | -1956 |
| 53 | -60 |
| 54 | 11 |
| 55 | -1 |