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A391693
as a simple table
n
a(n)
1
1
2
4
3
19
4
78
5
359
6
1526
7
6544
8
27595
9
116025
10
480396
11
1973735
12
8049327
13
32661563
14
131897421
15
531069857
[1,4,19,78,359,1526,6544,27595,116025,480396, 1973735,8049327,32661563,131897421,531069857]