n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 24 |
4 | 149 |
5 | 927 |
6 | 5768 |
7 | 35890 |
8 | 223317 |
9 | 1389537 |
10 | 8646064 |
11 | 53798080 |
12 | 334745777 |
13 | 2082876103 |
14 | 12960201916 |
15 | 80641778674 |
16 | 501774317241 |
17 | 3122171529233 |
18 | 19426970897100 |
19 | 120879712950776 |
20 | 752145307699165 |
21 | 4680045560037375 |
22 | 29120472094716576 |
[1,1,4,24,149,927,5768,35890,223317,1389537, 8646064,53798080,334745777,2082876103,12960201916, 80641778674,501774317241,3122171529233, 19426970897100,120879712950776,752145307699165, 4680045560037375,29120472094716576] |