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 | 54 |
| 3 | 1269 |
| 4 | 16804 |
| 5 | 134406 |
| 6 | 628398 |
| 7 | 1311968 |
| 8 | -1701864 |
| 9 | -14345991 |
| 10 | -16443324 |
| 11 | 25426764 |
| 12 | 11246580 |
| 13 | 16601078 |
| 14 | 505866816 |
| 15 | -113853762 |
| 16 | -1326884336 |
| 17 | 1507092642 |
| 18 | -3873575034 |
| 19 | 100819028 |
| 20 | 2685180888 |
| 21 | 6885133920 |
| 22 | -20849400 |
| 23 | 10111254408 |
| 24 | -10371867912 |
| 25 | -412371305 |
| 26 | -58625773596 |