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A155242
as a simple table
n
a(n)
4
1
5
7
6
19
7
70
8
235
9
1578
10
9621
11
89416
12
823589
13
11073433
14
160764354
15
3227749885
16
73045396627
17
2178986476482
[1,7,19,70,235,1578,9621,89416,823589,11073433, 160764354,3227749885,73045396627,2178986476482]