n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 3 |
7 | 6 |
8 | 9 |
9 | 29 |
10 | 71 |
11 | 252 |
12 | 692 |
13 | 3368 |
14 | 13077 |
15 | 79134 |
16 | 377418 |
17 | 2968590 |
18 | 18765157 |
19 | 189063004 |
20 | 1516592933 |
21 | 19680440925 |
22 | 204860397699 |
23 | 3422227126547 |
24 | 45691959144342 |
25 | 982062906171101 |
26 | 16911337817136038 |
27 | 468085274414196900 |
[1,1,1,1,2,3,6,9,29,71,252,692,3368,13077,79134, 377418,2968590,18765157,189063004,1516592933, 19680440925,204860397699,3422227126547, 45691959144342,982062906171101,16911337817136038, 468085274414196900] |