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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 11811 |
| 5 | 0 |
| 6 | 9259824 |
| 7 | 391054336 |
| 8 | 38553650604 |
| 9 | 2265732539392 |
| 10 | 68280280699008 |
| 11 | 1154069876800512 |
| 12 | 8265491604401052 |
| 13 | -143943691640103936 |
| 14 | -8466492132118562640 |
| 15 | -348452128209175345152 |
| 16 | -16647456396472383280364 |
| 17 | -869712709618533274712064 |