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 | 0 |
| 5 | -25 |
| 6 | 36 |
| 7 | -49 |
| 8 | 0 |
| 9 | 0 |
| 10 | 100 |
| 11 | -121 |
| 12 | 0 |
| 13 | -169 |
| 14 | 196 |
| 15 | 225 |
| 16 | 0 |
| 17 | -289 |
| 18 | 0 |
| 19 | -361 |
| 20 | 0 |
| 21 | 441 |
| 22 | 484 |
| 23 | -529 |
| 24 | 0 |
| 25 | 0 |
| 26 | 676 |
| 27 | 0 |
| 28 | 0 |
| 29 | -841 |
| 30 | -900 |
| 31 | -961 |
| 32 | 0 |
| 33 | 1089 |
| 34 | 1156 |
| 35 | 1225 |
| 36 | 0 |
| 37 | -1369 |
| 38 | 1444 |
| 39 | 1521 |
| 40 | 0 |
| 41 | -1681 |
| 42 | -1764 |
| 43 | -1849 |
| 44 | 0 |
| 45 | 0 |
| 46 | 2116 |
| 47 | -2209 |
| 48 | 0 |
| 49 | 0 |
| 50 | 0 |
| 51 | 2601 |
| 52 | 0 |
| 53 | -2809 |
| 54 | 0 |
| 55 | 3025 |
| 56 | 0 |
| 57 | 3249 |
| 58 | 3364 |
| 59 | -3481 |
| 60 | 0 |
| 61 | -3721 |