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A261006 as a simple table

na(n)
01
11
21
33
414
5157
615942
7489980450
81392195547909966848
9789204635842035012967539870068113408

[1,1,1,3,14,157,15942,489980450,
 1392195547909966848,
 789204635842035012967539870068113408]