A032068 - OEIS

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A032068 as a simple table

n	a(n)
1	2
2	1
3	2
4	7
5	22
6	85
7	344
8	1408
9	5914
10	25394
11	110818
12	488688
13	2178594
14	9797950
15	44406134
16	202591861
17	929716110
18	4288808485
19	19876422076
20	92501558277
21	432109230664
22	2025444499805
23	9523528005822
24	44906724639089

[2,1,2,7,22,85,344,1408,5914,25394,110818,488688, 2178594,9797950,44406134,202591861,929716110, 4288808485,19876422076,92501558277,432109230664, 2025444499805,9523528005822,44906724639089]