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A111413
as a simple table
n
a(n)
0
0
1
0
2
0
3
15
4
19391512129
5
703237958001393736999896827714634659411015090272684227831001142371615151
[0,0,0,15,19391512129, 70323795800139373699989682771463465941101509027268\ 4227831001142371615151]