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A360081
as a simple table
n
a(n)
0
3
1
19
2
31
3
691
4
907
5
2887
6
15943
7
69283
8
216127
9
1108831
10
8344423
11
10976347
12
166965391
13
385465771
14
26580643
[3,19,31,691,907,2887,15943,69283,216127,1108831, 8344423,10976347,166965391,385465771,26580643]