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A155290 as a simple table

na(n)
41
57
625
764
8265
91577
1011987
11107928
121180991
1315701569
14264954393
155697447937
16151647215266

[1,7,25,64,265,1577,11987,107928,1180991,15701569,
 264954393,5697447937,151647215266]