n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 72 |
5 | 264 |
6 | 984 |
7 | 3712 |
8 | 14136 |
9 | 54224 |
10 | 209200 |
11 | 810912 |
12 | 3155616 |
13 | 12320512 |
14 | 48239232 |
15 | 189336192 |
16 | 744722400 |
17 | 2934759360 |
18 | 11584470336 |
19 | 45796087680 |
20 | 181285742592 |
21 | 718498695424 |
22 | 2850802065152 |
23 | 11322567705600 |
24 | 45011437903104 |
25 | 179088911779328 |
[1,2,6,20,72,264,984,3712,14136,54224,209200, 810912,3155616,12320512,48239232,189336192, 744722400,2934759360,11584470336,45796087680, 181285742592,718498695424,2850802065152, 11322567705600,45011437903104,179088911779328] |