n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 24 |
5 | 88 |
6 | 336 |
7 | 1321 |
8 | 5316 |
9 | 21788 |
10 | 90640 |
11 | 381750 |
12 | 1624592 |
13 | 6975136 |
14 | 30177056 |
15 | 131428917 |
16 | 575765820 |
17 | 2535433668 |
18 | 11216757104 |
19 | 49829385786 |
20 | 222193501760 |
21 | 994153952528 |
22 | 4461915817760 |
23 | 20082611971226 |
24 | 90625360612296 |
[1,1,2,7,24,88,336,1321,5316,21788,90640,381750, 1624592,6975136,30177056,131428917,575765820, 2535433668,11216757104,49829385786,222193501760, 994153952528,4461915817760,20082611971226, 90625360612296] |