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A155231 as a simple table

na(n)
31
47
525
655
7259
82433
926055
10255284
113429704
1271355614
131963935839
1463893300754
152652285259513
16148465098222315

[1,7,25,55,259,2433,26055,255284,3429704,71355614,
 1963935839,63893300754,2652285259513,
 148465098222315]