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A281548
as a simple table
n
a(n)
0
1
1
3
2
11
3
46
4
210
5
1018
6
5150
7
26889
8
143829
9
784167
10
4341843
11
24348352
12
138007784
13
789375504
14
4550522248
[1,3,11,46,210,1018,5150,26889,143829,784167, 4341843,24348352,138007784,789375504,4550522248]