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A170946 as a simple table

na(n)
12
25
320
4107
5870
69436
7122840
81863359
932019826
10613981447
1112989756316
12300559406027
137550660328494
14204687564072918
155955893472990664
16185158932576089787
176125200100394894738
18214837724735760642773

[2,5,20,107,870,9436,122840,1863359,32019826,
 613981447,12989756316,300559406027,7550660328494,
 204687564072918,5955893472990664,
 185158932576089787,6125200100394894738,
 214837724735760642773]