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 | 2 |
| 2 | 544 |
| 3 | 1933442 |
| 4 | 152544843904 |
| 5 | 298022376588343682 |
| 6 | 14551915078272216509641504 |
| 7 | 17763568393763205317547489159863042 |
| 8 | 542101086242748783319906107922486197863801344 |