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 | 5 |
| 1 | 147 |
| 2 | 3283 |
| 3 | 67284 |
| 4 | 1346625 |
| 5 | 27061650 |
| 6 | 553887180 |
| 7 | 11636745120 |
| 8 | 252045153360 |
| 9 | 5641615980000 |
| 10 | 130658463936000 |
| 11 | 3132519418828800 |
| 12 | 77747158404115200 |
| 13 | 1997070421868121600 |
| 14 | 53066619106300800000 |