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 | 4 |
| 4 | 1 |
| 5 | 9 |
| 6 | 1 |
| 7 | 16 |
| 8 | 27 |
| 9 | 25 |
| 10 | 1 |
| 11 | 36 |
| 12 | 1 |
| 13 | 49 |
| 14 | -75 |
| 15 | 64 |
| 16 | 1 |
| 17 | 81 |
| 18 | -1 |
| 19 | 100 |
| 20 | 49 |
| 21 | 121 |
| 22 | -1 |
| 23 | 144 |
| 24 | 125 |
| 25 | 169 |
| 26 | -243 |
| 27 | 196 |
| 28 | 1 |
| 29 | 225 |
| 30 | -1 |
| 31 | 256 |
| 32 | 363 |
| 33 | 289 |
| 34 | -1225 |
| 35 | 324 |
| 36 | 1 |
| 37 | 361 |
| 38 | -169 |
| 39 | 400 |
| 40 | 1 |
| 41 | 441 |
| 42 | -1 |
| 43 | 484 |
| 44 | 135 |
| 45 | 529 |
| 46 | -1 |
| 47 | 576 |
| 48 | 343 |
| 49 | 625 |
| 50 | -867 |
| 51 | 676 |
| 52 | 1 |
| 53 | 729 |
| 54 | -3025 |
| 55 | 784 |
| 56 | 361 |
| 57 | 841 |
| 58 | -1 |