n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 20 |
3 | 68 |
4 | 230 |
5 | 774 |
6 | 2600 |
7 | 8732 |
8 | 29330 |
9 | 98526 |
10 | 330980 |
11 | 1111868 |
12 | 3735110 |
13 | 12547374 |
14 | 42150440 |
15 | 141596132 |
16 | 475664450 |
17 | 1597901526 |
18 | 5367837140 |
19 | 18032197268 |
20 | 60575633990 |
21 | 203491974774 |
22 | 683591422280 |
23 | 2296391457932 |
24 | 7714277207570 |
25 | 25914602943726 |
26 | 87055031555300 |
[2,6,20,68,230,774,2600,8732,29330,98526,330980, 1111868,3735110,12547374,42150440,141596132, 475664450,1597901526,5367837140,18032197268, 60575633990,203491974774,683591422280, 2296391457932,7714277207570,25914602943726, 87055031555300] |