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A155298 as a simple table

na(n)
41
57
625
755
8229
91191
108727
1174357
12700043
137963463
14116098934
152137593164
1648102627816

[1,7,25,55,229,1191,8727,74357,700043,7963463,
 116098934,2137593164,48102627816]