n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 25 |
6 | 70 |
7 | 196 |
8 | 588 |
9 | 1764 |
10 | 5544 |
11 | 17424 |
12 | 56628 |
13 | 184041 |
14 | 613470 |
15 | 2044900 |
16 | 6952660 |
17 | 23639044 |
18 | 81662152 |
19 | 282105616 |
20 | 987369656 |
21 | 3455793796 |
22 | 12228193432 |
23 | 43268992144 |
24 | 154532114800 |
25 | 551900410000 |
26 | 1986841476000 |
27 | 7152629313600 |
[1,1,2,4,10,25,70,196,588,1764,5544,17424,56628, 184041,613470,2044900,6952660,23639044,81662152, 282105616,987369656,3455793796,12228193432, 43268992144,154532114800,551900410000, 1986841476000,7152629313600] |