n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 31 |
6 | 246 |
7 | 1296 |
8 | 10774 |
9 | 83238 |
10 | 788820 |
11 | 6835170 |
12 | 81364944 |
13 | 848378532 |
14 | 11423650616 |
15 | 156289508025 |
16 | 2380629720720 |
17 | 33284133330760 |
18 | 605934954285120 |
19 | 9708364832948820 |
20 | 190330953679235040 |
21 | 3715069138923234960 |
22 | 77101583995105472880 |
23 | 1506549946554254503440 |
[1,1,1,4,13,31,246,1296,10774,83238,788820, 6835170,81364944,848378532,11423650616, 156289508025,2380629720720,33284133330760, 605934954285120,9708364832948820, 190330953679235040,3715069138923234960, 77101583995105472880,1506549946554254503440] |