n | a(n) |
---|---|
1 | 3 |
2 | 12 |
3 | 50 |
4 | 160 |
5 | 525 |
6 | 1540 |
7 | 4662 |
8 | 13104 |
9 | 38346 |
10 | 105336 |
11 | 303732 |
12 | 823680 |
13 | 2361645 |
14 | 6357780 |
15 | 18208190 |
16 | 48814480 |
17 | 139952670 |
18 | 374315656 |
19 | 1075431084 |
20 | 2872519104 |
21 | 8273365282 |
22 | 22082137896 |
23 | 63760878300 |
24 | 170112213600 |
25 | 492371090100 |
[3,12,50,160,525,1540,4662,13104,38346,105336, 303732,823680,2361645,6357780,18208190,48814480, 139952670,374315656,1075431084,2872519104, 8273365282,22082137896,63760878300,170112213600, 492371090100] |