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A124639 as a simple table

na(n)
01
10
23
34
412
520
652
784
8198
9352
10730
111332
122648
134808
149232
1516780
1631227
1756312
18102641
19182808

[1,0,3,4,12,20,52,84,198,352,730,1332,2648,4808,
 9232,16780,31227,56312,102641,182808]