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A196740 as a simple table

na(n)
11
21
320
4401
535202
67942712
75423213789
810714890351493
961977591097741664
101045534716234234877628
1151543884247862488090471612

[1,1,20,401,35202,7942712,5423213789,
 10714890351493,61977591097741664,
 1045534716234234877628,51543884247862488090471612]