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 | -72 |
| 2 | 1512 |
| 3 | -3744 |
| 4 | -95544 |
| 5 | -473904 |
| 6 | -1538784 |
| 7 | -3947328 |
| 8 | -8597880 |
| 9 | -16987176 |
| 10 | -30607632 |
| 11 | -52030944 |
| 12 | -83972448 |
| 13 | -129500784 |
| 14 | -194056128 |
| 15 | -279446976 |
| 16 | -397468152 |
| 17 | -544155408 |
| 18 | -743106744 |
| 19 | -978896160 |
| 20 | -1296984528 |
| 21 | -1654458624 |
| 22 | -2139055776 |
| 23 | -2661349824 |
| 24 | -3370243680 |
| 25 | -4106376504 |
| 26 | -5113466064 |