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A374681 as a simple table

na(n)
01
11
22
34
47
514
627
750
896
9185
10353
11672
121289
132466
144722
159052
1617342
1733244
1863767
19122325
20234727
21450553
22864975
231660951
243190089
256128033

[1,1,2,4,7,14,27,50,96,185,353,672,1289,2466,4722,
 9052,17342,33244,63767,122325,234727,450553,
 864975,1660951,3190089,6128033]