n | a(n) |
---|---|
1 | 3 |
2 | 9 |
3 | 33 |
4 | 120 |
5 | 480 |
6 | 2079 |
7 | 9044 |
8 | 39604 |
9 | 170835 |
10 | 720348 |
11 | 3105394 |
12 | 14050148 |
13 | 64838808 |
14 | 295178921 |
15 | 1315098518 |
16 | 5765163507 |
17 | 25132740083 |
18 | 110592507674 |
19 | 498297998116 |
20 | 2314042703759 |
21 | 10991409243669 |
22 | 52236818282458 |
23 | 242186086327901 |
[3,9,33,120,480,2079,9044,39604,170835,720348, 3105394,14050148,64838808,295178921,1315098518, 5765163507,25132740083,110592507674,498297998116, 2314042703759,10991409243669,52236818282458, 242186086327901] |