A139174 - OEIS

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A139174 as a simple table

n	a(n)
4	5
5	29
6	179
7	1259
8	10079
9	90719
10	907199
11	9979199
12	119750399
13	1556755199
14	21794572799
15	326918591999
16	5230697471999
17	88921857023999
18	1600593426431999
19	30411275102207999
20	608225502044159999

[5,29,179,1259,10079,90719,907199,9979199, 119750399,1556755199,21794572799,326918591999, 5230697471999,88921857023999,1600593426431999, 30411275102207999,608225502044159999]