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 | 30496564010000 |
18 | 482341877812000 |
19 | 8342949421288000 |
20 | 124613700640580000 |
21 | 1733826182453140000 |
22 | 36635355834463000000 |
23 | 597186420007933040000 |
[1,1,2,4,10,50,220,1240,6140,32860,602200,5668400, 62030200,522328600,4487190800,62591332000, 715163146000,30496564010000,482341877812000, 8342949421288000,124613700640580000, 1733826182453140000,36635355834463000000, 597186420007933040000] |