n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 115974 |
11 | 678514 |
12 | 4211825 |
13 | 27602602 |
14 | 190077045 |
15 | 1368705291 |
16 | 10254521370 |
17 | 79527284317 |
18 | 635182667816 |
19 | 5199414528808 |
20 | 43426867585575 |
21 | 368654643520692 |
22 | 3170300933550687 |
23 | 27542984610086665 |
24 | 241205285284001240 |
[1,1,2,5,15,52,203,877,4140,21147,115974,678514, 4211825,27602602,190077045,1368705291,10254521370, 79527284317,635182667816,5199414528808, 43426867585575,368654643520692,3170300933550687, 27542984610086665,241205285284001240] |