n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 50 |
6 | 150 |
7 | 490 |
8 | 1600 |
9 | 5400 |
10 | 18450 |
11 | 64130 |
12 | 225264 |
13 | 800046 |
14 | 2865226 |
15 | 10341150 |
16 | 37566720 |
17 | 137270954 |
18 | 504171432 |
19 | 1860277042 |
20 | 6892317200 |
21 | 25631327190 |
22 | 95640829922 |
23 | 357975249026 |
24 | 1343650040256 |
25 | 5056424257500 |
26 | 19073789328750 |
27 | 72108867614796 |
[2,2,6,16,50,150,490,1600,5400,18450,64130,225264, 800046,2865226,10341150,37566720,137270954, 504171432,1860277042,6892317200,25631327190, 95640829922,357975249026,1343650040256, 5056424257500,19073789328750,72108867614796] |