A030914 - OEIS

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A030914 as a simple table

n	a(n)
1	1
2	2
3	6
4	27
5	137
6	822
7	5758
8	46070
9	414637
10	4146378
11	45610165
12	547321987
13	7115185831
14	99612601644
15	1494189024672
16	23907024394756
17	406419414710865
18	7315549464795573
19	138995439831115897
20	2779908796622317955

[1,2,6,27,137,822,5758,46070,414637,4146378, 45610165,547321987,7115185831,99612601644, 1494189024672,23907024394756,406419414710865, 7315549464795573,138995439831115897, 2779908796622317955]