A155361 - OEIS

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A155361 as a simple table

n	a(n)
4	1
5	7
6	19
7	37
8	61
9	398
10	3352
11	18677
12	76887
13	524948
14	7212413
15	105020342
16	1220235443
17	15236713872
18	301443806483
19	8288724969974
20	237668565804989
21	6783028496183063

[1,7,19,37,61,398,3352,18677,76887,524948,7212413, 105020342,1220235443,15236713872,301443806483, 8288724969974,237668565804989,6783028496183063]