n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 56 |
4 | 420 |
5 | 3564 |
6 | 33033 |
7 | 327184 |
8 | 3413124 |
9 | 37119160 |
10 | 417733316 |
11 | 4837527072 |
12 | 57397642640 |
13 | 695394516600 |
14 | 8579210711625 |
15 | 107541060458400 |
16 | 1367139314643300 |
17 | 17599273282621800 |
18 | 229116465142280100 |
19 | 3013124257920348000 |
20 | 39991185556010816400 |
[1,2,9,56,420,3564,33033,327184,3413124,37119160, 417733316,4837527072,57397642640,695394516600, 8579210711625,107541060458400,1367139314643300, 17599273282621800,229116465142280100, 3013124257920348000,39991185556010816400] |