n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 70 |
7 | 255 |
8 | 959 |
9 | 3696 |
10 | 14520 |
11 | 57930 |
12 | 234080 |
13 | 955999 |
14 | 3939949 |
15 | 16364985 |
16 | 68437033 |
17 | 287910048 |
18 | 1217627176 |
19 | 5173854018 |
20 | 22077273858 |
21 | 94564541166 |
22 | 406451008386 |
23 | 1752472631360 |
24 | 7577758539846 |
25 | 32852955892191 |
[1,1,2,6,20,70,255,959,3696,14520,57930,234080, 955999,3939949,16364985,68437033,287910048, 1217627176,5173854018,22077273858,94564541166, 406451008386,1752472631360,7577758539846, 32852955892191] |