n | a(n) |
---|---|
4 | 1 |
5 | 2 |
6 | 7 |
7 | 22 |
8 | 72 |
9 | 230 |
10 | 751 |
11 | 2442 |
12 | 8006 |
13 | 26280 |
14 | 86604 |
15 | 285994 |
16 | 946866 |
17 | 3140812 |
18 | 10438300 |
19 | 34747649 |
20 | 115849084 |
21 | 386779317 |
22 | 1292998720 |
23 | 4327654320 |
24 | 14500841169 |
25 | 48639319376 |
26 | 163308287353 |
27 | 548820437392 |
28 | 1845999502151 |
29 | 6214297279692 |
30 | 20935992503127 |
31 | 70586182742450 |
[1,2,7,22,72,230,751,2442,8006,26280,86604,285994, 946866,3140812,10438300,34747649,115849084, 386779317,1292998720,4327654320,14500841169, 48639319376,163308287353,548820437392, 1845999502151,6214297279692,20935992503127, 70586182742450] |