A155446 - OEIS

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A155446 as a simple table

n	a(n)
6	1
7	7
8	19
9	37
10	61
11	198
12	961
13	7036
14	35739
15	164475
16	1020808
17	9067997
18	101564763
19	1167745653
20	13478588062
21	184107863480
22	3150709806656
23	65431262534013

[1,7,19,37,61,198,961,7036,35739,164475,1020808, 9067997,101564763,1167745653,13478588062, 184107863480,3150709806656,65431262534013]