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A155307 as a simple table

na(n)
41
54
613
737
8146
9620
102737
1117298
12136979
131185666
1412752003
15161758550
162364549128
1742702118766

[1,4,13,37,146,620,2737,17298,136979,1185666,
 12752003,161758550,2364549128,42702118766]