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A337220 as a simple table

na(n)
12
21
31
41
51
63
75
81
927
1041
1119
12565
131
147085
1525
163
171266205
189
199099507
2017602325
211
22128207979
231657009
2426494256091
25172961
26331
2711147523830125
2884179432287299
292405
30145
31297758653049289
329007199254741
331
34281629680514649643
35125400505
364246732448623781667
37113

[2,1,1,1,1,3,5,1,27,41,19,565,1,7085,25,3,1266205,
 9,9099507,17602325,1,128207979,1657009,
 26494256091,172961,331,11147523830125,
 84179432287299,2405,145,297758653049289,
 9007199254741,1,281629680514649643,125400505,
 4246732448623781667,113]