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A197593 as a simple table

na(n)
11
21
34
418
598
61460
735691
81385653
9113578137
1017175107452
114747357788947
122462207136693903

[1,1,4,18,98,1460,35691,1385653,113578137,
 17175107452,4747357788947,2462207136693903]