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A006721 as a simple table

na(n)
01
11
21
31
41
52
63
75
811
937
1083
11274
121217
136161
1422833
15165713
161249441
179434290
1868570323
191013908933
2011548470571
21142844426789
222279343327171
2357760865728994
24979023970244321
2523510036246274433
26771025645214210753

[1,1,1,1,1,2,3,5,11,37,83,274,1217,6161,22833,
 165713,1249441,9434290,68570323,1013908933,
 11548470571,142844426789,2279343327171,
 57760865728994,979023970244321,23510036246274433,
 771025645214210753]