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A139416 as a simple table

na(n)
13
26
312
470
5600281
660
71458
8264
9450
10266875
1112670498046853
12480
133998684814453099
1411968722
15299538
163640
1749921080474853515591
181980
196107691150665283203125
2014960
21575047378296833
224068173828125
2313936286848094463348388671875
246552
255035427051913

[3,6,12,70,600281,60,1458,264,450,266875,
 12670498046853,480,3998684814453099,11968722,
 299538,3640,49921080474853515591,1980,
 6107691150665283203125,14960,575047378296833,
 4068173828125,13936286848094463348388671875,6552,
 5035427051913]