n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 60 |
5 | 202 |
6 | 718 |
7 | 2600 |
8 | 9748 |
9 | 37270 |
10 | 146058 |
11 | 582548 |
12 | 2367028 |
13 | 9761890 |
14 | 40844168 |
15 | 173001018 |
16 | 741193056 |
17 | 3207480526 |
18 | 14008373662 |
19 | 61683982696 |
20 | 273658651700 |
21 | 1222314257450 |
22 | 5493414465900 |
23 | 24828463984518 |
[1,2,6,18,60,202,718,2600,9748,37270,146058, 582548,2367028,9761890,40844168,173001018, 741193056,3207480526,14008373662,61683982696, 273658651700,1222314257450,5493414465900, 24828463984518] |