A146838 - OEIS

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A146838 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	21
7	51
8	217
9	1233
10	6449
11	45131
12	442147
13	4714111
14	71906123
15	1148024329
16	26742683865
17	642806579973

[1,1,1,1,1,21,51,217,1233,6449,45131,442147, 4714111,71906123,1148024329,26742683865, 642806579973]