n | a(n) |
---|---|
2 | 1 |
3 | 21 |
4 | 378 |
5 | 6545 |
6 | 111930 |
7 | 1906884 |
8 | 32468436 |
9 | 553270671 |
10 | 9440350920 |
11 | 161322559475 |
12 | 2761025887620 |
13 | 47325339895743 |
14 | 812325612855848 |
15 | 13961746143269400 |
16 | 240260199935164200 |
17 | 4139207762053520646 |
[1,21,378,6545,111930,1906884,32468436,553270671, 9440350920,161322559475,2761025887620, 47325339895743,812325612855848,13961746143269400, 240260199935164200,4139207762053520646] |