n | a(n) |
---|---|
1 | 2 |
2 | 12 |
3 | 40 |
4 | 144 |
5 | 550 |
6 | 1896 |
7 | 7584 |
8 | 27328 |
9 | 105348 |
10 | 398760 |
11 | 1538696 |
12 | 5872800 |
13 | 22646862 |
14 | 87492676 |
15 | 339055650 |
16 | 1313842904 |
17 | 5104724558 |
18 | 19873572892 |
19 | 77470783406 |
20 | 302258087616 |
21 | 1180840902336 |
22 | 4618922848536 |
23 | 18083348822516 |
24 | 70852652846320 |
[2,12,40,144,550,1896,7584,27328,105348,398760, 1538696,5872800,22646862,87492676,339055650, 1313842904,5104724558,19873572892,77470783406, 302258087616,1180840902336,4618922848536, 18083348822516,70852652846320] |