n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 9 |
5 | 28 |
6 | 48 |
7 | 145 |
8 | 250 |
9 | 831 |
10 | 1404 |
11 | 4664 |
12 | 7875 |
13 | 26748 |
14 | 44960 |
15 | 154265 |
16 | 258777 |
17 | 896644 |
18 | 1501060 |
19 | 5239975 |
20 | 8758640 |
21 | 30760060 |
22 | 51350784 |
23 | 181258264 |
24 | 302271736 |
25 | 1071490551 |
26 | 1785262500 |
27 | 6351444132 |
28 | 10574365725 |
29 | 37738804488 |
30 | 62788919872 |
[1,1,2,5,9,28,48,145,250,831,1404,4664,7875,26748, 44960,154265,258777,896644,1501060,5239975, 8758640,30760060,51350784,181258264,302271736, 1071490551,1785262500,6351444132,10574365725, 37738804488,62788919872] |