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A068054 as a simple table

na(n)
12
25
310
423
543
697
7183
8387
9761
101525
113070
126109
1312331
1424570
1549119
1698308
17196634
18393229
19786794
201573225

[2,5,10,23,43,97,183,387,761,1525,3070,6109,12331,
 24570,49119,98308,196634,393229,786794,1573225]