n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 112 |
6 | 560 |
7 | 2888 |
8 | 15136 |
9 | 80160 |
10 | 427968 |
11 | 2300736 |
12 | 12445440 |
13 | 67702272 |
14 | 370205184 |
15 | 2033976960 |
16 | 11224014336 |
17 | 62186741248 |
18 | 345825348608 |
19 | 1929744008192 |
20 | 10802203119616 |
21 | 60644473282560 |
22 | 341383505977344 |
[1,1,2,6,24,112,560,2888,15136,80160,427968, 2300736,12445440,67702272,370205184,2033976960, 11224014336,62186741248,345825348608, 1929744008192,10802203119616,60644473282560, 341383505977344] |