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A147066 as a simple table

na(n)
11
21
31
41
55
613
728
877
9344
101851
1111392
1275139
13594346
145700553
1566311093
16914949886

[1,1,1,1,5,13,28,77,344,1851,11392,75139,594346,
 5700553,66311093,914949886]