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A155226 as a simple table

na(n)
31
47
519
658
7329
82350
920015
10218371
113090717
1258164789
131393078738
1442785732400
151703751776933
1687700729777393
175826804979644472

[1,7,19,58,329,2350,20015,218371,3090717,58164789,
 1393078738,42785732400,1703751776933,
 87700729777393,5826804979644472]