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 | 3 |
| 3 | -9 |
| 4 | 28 |
| 5 | -25 |
| 6 | -27 |
| 7 | -49 |
| 8 | 224 |
| 9 | 0 |
| 10 | -75 |
| 11 | -121 |
| 12 | -252 |
| 13 | -169 |
| 14 | -147 |
| 15 | 225 |
| 16 | 1792 |
| 17 | -289 |
| 18 | 0 |
| 19 | -361 |
| 20 | -700 |
| 21 | 441 |
| 22 | -363 |
| 23 | -529 |
| 24 | -2016 |
| 25 | 0 |
| 26 | -507 |
| 27 | 0 |
| 28 | -1372 |
| 29 | -841 |
| 30 | 675 |
| 31 | -961 |
| 32 | 14336 |
| 33 | 1089 |
| 34 | -867 |
| 35 | 1225 |
| 36 | 0 |
| 37 | -1369 |
| 38 | -1083 |
| 39 | 1521 |
| 40 | -5600 |
| 41 | -1681 |
| 42 | 1323 |
| 43 | -1849 |
| 44 | -3388 |
| 45 | 0 |
| 46 | -1587 |
| 47 | -2209 |
| 48 | -16128 |
| 49 | 0 |
| 50 | 0 |
| 51 | 2601 |
| 52 | -4732 |
| 53 | -2809 |
| 54 | 0 |
| 55 | 3025 |
| 56 | -10976 |