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A146730
as a simple table
n
a(n)
1
1
2
1
3
1
4
17
5
49
6
253
7
4269
8
109305
9
2719409
10
106590781
11
8186380289
12
970653688319
13
155798879951445
[1,1,1,17,49,253,4269,109305,2719409,106590781, 8186380289,970653688319,155798879951445]