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A036688
as a simple table
n
a(n)
1
5
2
18
3
119
4
698
5
5449
6
41735
7
359207
8
3085197
9
27434602
10
243921771
11
2188569304
12
19636586858
[5,18,119,698,5449,41735,359207,3085197,27434602, 243921771,2188569304,19636586858]