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A197785 as a simple table

na(n)
11
21
37
464
5805
621526
71060565
895311741
915835547951
104848154085309
112730611548295716
122833706084143411564

[1,1,7,64,805,21526,1060565,95311741,15835547951,
 4848154085309,2730611548295716,
 2833706084143411564]