n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 26 |
6 | 152 |
7 | 1144 |
8 | 10742 |
9 | 122772 |
10 | 1673856 |
11 | 26780972 |
12 | 496090330 |
13 | 10519217930 |
14 | 252851833482 |
15 | 6832018188414 |
16 | 205985750827854 |
17 | 6885220780488694 |
18 | 253685194149119818 |
19 | 10250343686634687424 |
20 | 452108221967363310278 |
21 | 21676762640915055856716 |
[1,1,2,6,26,152,1144,10742,122772,1673856, 26780972,496090330,10519217930,252851833482, 6832018188414,205985750827854,6885220780488694, 253685194149119818,10250343686634687424, 452108221967363310278,21676762640915055856716] |