n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 15 |
3 | 120 |
4 | 528 |
5 | 4095 |
6 | 17955 |
7 | 139128 |
8 | 609960 |
9 | 4726275 |
10 | 20720703 |
11 | 160554240 |
12 | 703893960 |
13 | 5454117903 |
14 | 23911673955 |
15 | 185279454480 |
16 | 812293020528 |
17 | 6294047334435 |
18 | 27594051024015 |
19 | 213812329916328 |
20 | 937385441796000 |
21 | 7263325169820735 |
22 | 31843510970040003 |
23 | 246739243443988680 |
[0,3,15,120,528,4095,17955,139128,609960,4726275, 20720703,160554240,703893960,5454117903, 23911673955,185279454480,812293020528, 6294047334435,27594051024015,213812329916328, 937385441796000,7263325169820735, 31843510970040003,246739243443988680] |