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A081255
as a simple table
n
a(n)
0
3
1
1
2
4
3
7
4
29
5
199
6
5778
7
1149851
8
6643838879
9
7639424778862807
[3,1,4,7,29,199,5778,1149851,6643838879, 7639424778862807]