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A206874 as a simple table

na(n)
121
2441
33967
455063
5728935
68942469
7115505069
81476136671
918751133599
10239558002631
113055238118019
1238950706917793
13496876286463839
146336882323606735
1580816445128377245
161030742612403238579

[21,441,3967,55063,728935,8942469,115505069,
 1476136671,18751133599,239558002631,3055238118019,
 38950706917793,496876286463839,6336882323606735,
 80816445128377245,1030742612403238579]