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A242619
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
0
5
20449
6
1438793759
7
8479443857936402504
8
17340632172455487023654788790090010704
[0,0,0,0,0,20449,1438793759,8479443857936402504, 17340632172455487023654788790090010704]