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A261005 as a simple table

na(n)
01
11
22
35
420
5180
616143
7489996795
81392195548399980210
9789204635842035039135545297410259322

[1,1,2,5,20,180,16143,489996795,
 1392195548399980210,
 789204635842035039135545297410259322]