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) |
|---|---|
| 1 | 18 |
| 2 | 360 |
| 3 | 2880 |
| 4 | 46128 |
| 5 | 299646 |
| 6 | 7113600 |
| 7 | 35893440 |
| 8 | 686393568 |
| 9 | 5105934720 |
| 10 | 80436972240 |
| 11 | 513593801496 |
| 12 | 14266630210560 |
| 13 | 62197735384584 |
| 14 | 1165770116121600 |
| 15 | 9349887314805120 |
| 16 | 157025981601707904 |
| 17 | 909804651298728804 |
| 18 | 22898038082582016000 |
| 19 | 110086362807146183340 |