n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 50 |
6 | 220 |
7 | 1240 |
8 | 6140 |
9 | 32860 |
10 | 602200 |
11 | 5668400 |
12 | 62030200 |
13 | 522328600 |
14 | 4487190800 |
15 | 62591332000 |
16 | 715163146000 |
17 | 9573774122000 |
18 | 105731659828000 |
19 | 1187355279592000 |
20 | 29205778751300000 |
21 | 481597207656340000 |
22 | 9086318388933400000 |
23 | 132525988426667120000 |
[1,1,2,4,10,50,220,1240,6140,32860,602200,5668400, 62030200,522328600,4487190800,62591332000, 715163146000,9573774122000,105731659828000, 1187355279592000,29205778751300000, 481597207656340000,9086318388933400000, 132525988426667120000] |