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A181041 as a simple table

na(n)
11
26
341
42128
5116416
638367065
717214692429
835303269554487
9126153392725718061
101662975394096566451171
1145555313556475090260636006

[1,6,41,2128,116416,38367065,17214692429,
 35303269554487,126153392725718061,
 1662975394096566451171,45555313556475090260636006]