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A091969 as a simple table

na(n)
11
21
31
44
528
6550
728456
84134861
91781622569
102407100396065
1110660643722901700
12159393017165624876022
138189716815725538561261887

[1,1,1,4,28,550,28456,4134861,1781622569,
 2407100396065,10660643722901700,
 159393017165624876022,8189716815725538561261887]