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A007839 as a simple table

na(n)
01
12
21
34
47
514
628
754
8111
9218
10436
11854
121735
133432
146825
1513664
1627352
1754218
18108714
19216616
20432239
21864548
221727408
233441364
246891458
2513756440
2627466896
2754922134
28109751871
29219035562
30438319568
31875529382

[1,2,1,4,7,14,28,54,111,218,436,854,1735,3432,
 6825,13664,27352,54218,108714,216616,432239,
 864548,1727408,3441364,6891458,13756440,27466896,
 54922134,109751871,219035562,438319568,875529382]