n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 52 |
5 | 540 |
6 | 6846 |
7 | 104832 |
8 | 1883848 |
9 | 38889360 |
10 | 907247770 |
11 | 23608391840 |
12 | 678039307452 |
13 | 21305543325248 |
14 | 727095737061526 |
15 | 26781816978470400 |
16 | 1059020025979194128 |
17 | 44746083421419997440 |
18 | 2011929587198990154162 |
19 | 95918808101232854969856 |
[0,1,2,6,52,540,6846,104832,1883848,38889360, 907247770,23608391840,678039307452,21305543325248, 727095737061526,26781816978470400, 1059020025979194128,44746083421419997440, 2011929587198990154162,95918808101232854969856] |