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 | 1 |
| 3 | -6 |
| 4 | -13 |
| 5 | 110 |
| 6 | 363 |
| 7 | -4214 |
| 8 | -18581 |
| 9 | 276678 |
| 10 | 1525355 |
| 11 | -27753022 |
| 12 | -183611829 |
| 13 | 3948004606 |
| 14 | 30473073547 |
| 15 | -756031185030 |
| 16 | -6669149100757 |
| 17 | 187521633674294 |
| 18 | 1860949703300139 |
| 19 | -58481734930175438 |
| 20 | -644853406058229365 |
| 21 | 22398157925324204142 |
| 22 | 271672536688626976331 |
| 23 | -10334883450918076967446 |