n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 4 |
5 | 20 |
6 | 158 |
7 | 819 |
8 | 3624 |
9 | 33984 |
10 | 427482 |
11 | 3819915 |
12 | 29665260 |
13 | 404822340 |
14 | 6948032310 |
15 | 88407058635 |
16 | 991515848400 |
17 | 17715286764000 |
18 | 383952670412850 |
19 | 6349179054589875 |
20 | 93532380775766100 |
21 | 2063197602667372500 |
22 | 53913667654307868750 |
23 | 1098018631195048591875 |
[0,0,2,3,4,20,158,819,3624,33984,427482,3819915, 29665260,404822340,6948032310,88407058635, 991515848400,17715286764000,383952670412850, 6349179054589875,93532380775766100, 2063197602667372500,53913667654307868750, 1098018631195048591875] |