n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 30 |
4 | 144 |
5 | 742 |
6 | 4012 |
7 | 22458 |
8 | 129035 |
9 | 756602 |
10 | 4509141 |
11 | 27233726 |
12 | 166320987 |
13 | 1025356360 |
14 | 6372494608 |
15 | 39882831334 |
16 | 251146002084 |
17 | 1590079213920 |
18 | 10115878798130 |
19 | 64634124182670 |
20 | 414578955678690 |
21 | 2668578654593970 |
22 | 17232252926468640 |
23 | 111602332042716450 |
[1,2,7,30,144,742,4012,22458,129035,756602, 4509141,27233726,166320987,1025356360,6372494608, 39882831334,251146002084,1590079213920, 10115878798130,64634124182670,414578955678690, 2668578654593970,17232252926468640, 111602332042716450] |