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A155310 as a simple table

na(n)
41
57
625
755
8184
91073
108931
1173812
12639377
137143496
14110082014
152154472585
1648658986855
171307630014597

[1,7,25,55,184,1073,8931,73812,639377,7143496,
 110082014,2154472585,48658986855,1307630014597]