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 | 6 |
| 2 | 60 |
| 3 | 594 |
| 4 | 5880 |
| 5 | 58206 |
| 6 | 576180 |
| 7 | 5703594 |
| 8 | 56459760 |
| 9 | 558894006 |
| 10 | 5532480300 |
| 11 | 54765908994 |
| 12 | 542126609640 |
| 13 | 5366500187406 |
| 14 | 53122875264420 |
| 15 | 525862252456794 |
| 16 | 5205499649303520 |
| 17 | 51529134240578406 |
| 18 | 510085842756480540 |
| 19 | 5049329293324226994 |
| 20 | 49983207090485789400 |