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A155296 as a simple table

na(n)
51
67
719
870
9328
101523
117988
1253382
13440756
144250070
1549171805
16677879590
1710958762075

[1,7,19,70,328,1523,7988,53382,440756,4250070,
 49171805,677879590,10958762075]