n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 18 |
4 | 126 |
5 | 958 |
6 | 7707 |
7 | 64564 |
8 | 557519 |
9 | 4928784 |
10 | 44398592 |
11 | 406119900 |
12 | 3762522607 |
13 | 35236156779 |
14 | 333052648607 |
15 | 3173351871750 |
16 | 30448930792460 |
17 | 293980976342244 |
18 | 2854070686906317 |
19 | 27845872331417000 |
20 | 272896298225616888 |
21 | 2685318944226499424 |
22 | 26521692874280137381 |
[1,1,3,18,126,958,7707,64564,557519,4928784, 44398592,406119900,3762522607,35236156779, 333052648607,3173351871750,30448930792460, 293980976342244,2854070686906317, 27845872331417000,272896298225616888, 2685318944226499424,26521692874280137381] |