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 | 8 |
| 2 | 56 |
| 3 | 384 |
| 4 | 2624 |
| 5 | 17920 |
| 6 | 122368 |
| 7 | 835584 |
| 8 | 5705728 |
| 9 | 38961152 |
| 10 | 266043392 |
| 11 | 1816657920 |
| 12 | 12404916224 |
| 13 | 84706066432 |
| 14 | 578409201664 |
| 15 | 3949625081856 |
| 16 | 26969727041536 |
| 17 | 184160815677440 |
| 18 | 1257528709087232 |
| 19 | 8586943147278336 |