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 | -3 |
| 2 | -9 |
| 3 | -6 |
| 4 | 10 |
| 5 | 25 |
| 6 | 15 |
| 7 | -21 |
| 8 | -49 |
| 9 | -28 |
| 10 | 36 |
| 11 | 81 |
| 12 | 45 |
| 13 | -55 |
| 14 | -121 |
| 15 | -66 |
| 16 | 78 |
| 17 | 169 |
| 18 | 91 |
| 19 | -105 |
| 20 | -225 |
| 21 | -120 |
| 22 | 136 |
| 23 | 289 |
| 24 | 153 |
| 25 | -171 |
| 26 | -361 |
| 27 | -190 |
| 28 | 210 |
| 29 | 441 |
| 30 | 231 |
| 31 | -253 |
| 32 | -529 |
| 33 | -276 |
| 34 | 300 |
| 35 | 625 |
| 36 | 325 |
| 37 | -351 |
| 38 | -729 |
| 39 | -378 |
| 40 | 406 |
| 41 | 841 |
| 42 | 435 |
| 43 | -465 |
| 44 | -961 |
| 45 | -496 |
| 46 | 528 |
| 47 | 1089 |
| 48 | 561 |
| 49 | -595 |
| 50 | -1225 |