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A215971 as a simple table

na(n)
11
21
32
44
59
620
748
8115
9286
10717
111815
124574
1311505
1428546
1569705
16166010

[1,1,2,4,9,20,48,115,286,717,1815,4574,11505,
 28546,69705,166010]