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 | 0 |
| 1 | 1 |
| 2 | -36 |
| 3 | -81 |
| 4 | 784 |
| 5 | -1314 |
| 6 | 2916 |
| 7 | -4480 |
| 8 | -9792 |
| 9 | 6561 |
| 10 | 47304 |
| 11 | 1476 |
| 12 | -63504 |
| 13 | -151522 |
| 14 | 161280 |
| 15 | 106434 |
| 16 | -48896 |
| 17 | 108162 |
| 18 | -236196 |
| 19 | 593084 |
| 20 | -1030176 |
| 21 | 362880 |
| 22 | -53136 |
| 23 | -969480 |
| 24 | 793152 |
| 25 | -226529 |
| 26 | 5454792 |
| 27 | -531441 |
| 28 | -3512320 |
| 29 | -6642522 |
| 30 | -3831624 |
| 31 | 7070600 |
| 32 | 6773760 |
| 33 | -119556 |
| 34 | -3893832 |