n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 28 |
5 | 121 |
6 | 560 |
7 | 2677 |
8 | 13230 |
9 | 66742 |
10 | 343092 |
11 | 1788681 |
12 | 9439870 |
13 | 50321865 |
14 | 270594896 |
15 | 1465941763 |
16 | 7993664588 |
17 | 43839212778 |
18 | 241650560756 |
19 | 1338084935826 |
20 | 7439615051328 |
21 | 41516113036777 |
22 | 232452845782308 |
23 | 1305500166481715 |
24 | 7352433083806020 |
25 | 41514430735834714 |
[0,1,2,7,28,121,560,2677,13230,66742,343092, 1788681,9439870,50321865,270594896,1465941763, 7993664588,43839212778,241650560756,1338084935826, 7439615051328,41516113036777,232452845782308, 1305500166481715,7352433083806020, 41514430735834714] |