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A155334 as a simple table

na(n)
51
67
719
837
9115
10485
112457
1216347
13114526
14862126
158042696
1692458257
171277007692
1821027306771
19403213961051
209036952144101

[1,7,19,37,115,485,2457,16347,114526,862126,
 8042696,92458257,1277007692,21027306771,
 403213961051,9036952144101]