n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 41 |
4 | 276 |
5 | 1861 |
6 | 12546 |
7 | 84581 |
8 | 570216 |
9 | 3844201 |
10 | 25916286 |
11 | 174718721 |
12 | 1177893756 |
13 | 7940956141 |
14 | 53535205626 |
15 | 360916014461 |
16 | 2433172114896 |
17 | 16403612761681 |
18 | 110587537144566 |
19 | 745543286675801 |
20 | 5026197405777636 |
[0,1,6,41,276,1861,12546,84581,570216,3844201, 25916286,174718721,1177893756,7940956141, 53535205626,360916014461,2433172114896, 16403612761681,110587537144566,745543286675801, 5026197405777636] |