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 | -4 |
| 3 | 9 |
| 4 | -16 |
| 5 | 25 |
| 6 | -36 |
| 7 | 49 |
| 8 | -64 |
| 9 | 81 |
| 10 | -100 |
| 11 | 121 |
| 12 | -144 |
| 13 | 169 |
| 14 | -196 |
| 15 | 225 |
| 16 | -256 |
| 17 | 289 |
| 18 | -324 |
| 19 | 361 |
| 20 | -400 |
| 21 | 441 |
| 22 | -484 |
| 23 | 529 |
| 24 | -576 |
| 25 | 625 |
| 26 | -676 |
| 27 | 729 |
| 28 | -784 |
| 29 | 841 |
| 30 | -900 |
| 31 | 961 |
| 32 | -1024 |
| 33 | 1089 |
| 34 | -1156 |
| 35 | 1225 |
| 36 | -1296 |
| 37 | 1369 |
| 38 | -1444 |
| 39 | 1521 |
| 40 | -1600 |
| 41 | 1681 |
| 42 | -1764 |
| 43 | 1849 |
| 44 | -1936 |
| 45 | 2025 |
| 46 | -2116 |
| 47 | 2209 |
| 48 | -2304 |
| 49 | 2401 |
| 50 | -2500 |