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 | 18 |
| 2 | 1752 |
| 3 | 282304 |
| 4 | 54547200 |
| 5 | 11478167040 |
| 6 | 2533556365312 |
| 7 | 576271774875648 |
| 8 | 133776598692003840 |
| 9 | 31513560479297044480 |
| 10 | 7505638177922587557888 |
| 11 | 1802924878727702252617728 |
| 12 | 436026430783762289982963712 |