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A078981 as a simple table

na(n)
01
15
26
317
440
597
6137
7371
82734
914041
1016775
1130816
1247591
13125998
14299587
155818151
166117738
1718053627
1824171365
19187253182
20211424547
21398677729
223799524108
234198201837
2416394129619
2520592331456
2636986461075
2794565253606

[1,5,6,17,40,97,137,371,2734,14041,16775,30816,
 47591,125998,299587,5818151,6117738,18053627,
 24171365,187253182,211424547,398677729,3799524108,
 4198201837,16394129619,20592331456,36986461075,
 94565253606]