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A123772
as a simple table
n
a(n)
1
1
2
3
3
17
4
107
5
761
6
5607
7
42730
8
331851
9
2618024
10
20895964
11
168398683
12
1367838390
13
11184711448
14
91976811135
[1,3,17,107,761,5607,42730,331851,2618024, 20895964,168398683,1367838390,11184711448, 91976811135]