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A018980 as a simple table

na(n)
22
37
425
5155
61109
76599
841916
9268294
101804922
1112288435
1284812079
13591842347
144174903242
1529718998597
16213198431987

[2,7,25,155,1109,6599,41916,268294,1804922,
 12288435,84812079,591842347,4174903242,
 29718998597,213198431987]