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A337887 as a simple table

na(n)
21
32
41
53
610
71
84
957
1090054
111
125
13240
141471640157
15629648865588086369152
161
176
18800
191466049174160
2076983765319971901895960429658208179
2176686070519895153193719509580895099970955878067526648007224125292544
221

[1,2,1,3,10,1,4,57,90054,1,5,240,1471640157,
 629648865588086369152,1,6,800,1466049174160,
 76983765319971901895960429658208179,
 76686070519895153193719509580895099970955878067526\
 648007224125292544,1]