n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 13 |
4 | 70 |
5 | 446 |
6 | 3276 |
7 | 27252 |
8 | 253296 |
9 | 2602224 |
10 | 29288160 |
11 | 358457760 |
12 | 4740577920 |
13 | 67375532160 |
14 | 1024208720640 |
15 | 16583626886400 |
16 | 284953145702400 |
17 | 5178968115148800 |
18 | 99268112350310400 |
19 | 2001336861359001600 |
20 | 42337994134947840000 |
21 | 937755916997437440000 |
[1,1,3,13,70,446,3276,27252,253296,2602224, 29288160,358457760,4740577920,67375532160, 1024208720640,16583626886400,284953145702400, 5178968115148800,99268112350310400, 2001336861359001600,42337994134947840000, 937755916997437440000] |