n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 20 |
5 | 86 |
6 | 516 |
7 | 3135 |
8 | 25080 |
9 | 196468 |
10 | 1964680 |
11 | 18827225 |
12 | 225926700 |
13 | 2559350288 |
14 | 35830904032 |
15 | 468385940355 |
16 | 7494175045680 |
17 | 111029569712844 |
18 | 1998532254831192 |
19 | 33092842524631733 |
20 | 661856850492634660 |
21 | 12113055891685809704 |
22 | 266487229617087813488 |
[1,1,2,5,20,86,516,3135,25080,196468,1964680, 18827225,225926700,2559350288,35830904032, 468385940355,7494175045680,111029569712844, 1998532254831192,33092842524631733, 661856850492634660,12113055891685809704, 266487229617087813488] |