A019004 - OEIS

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A019004 as a simple table

n	a(n)
2	2
3	7
4	46
5	214
6	1065
7	5699
8	32616
9	197650
10	1263478
11	8429302
12	57384582
13	392789991
14	2684522934
15	18317290667
16	125120073002

[2,7,46,214,1065,5699,32616,197650,1263478, 8429302,57384582,392789991,2684522934,18317290667, 125120073002]