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A208974 as a simple table

na(n)
12
215
387
4371
51185
63186
77425
815658
930368
1055222
1195087
12156612
13248194
14380753
15567639
16825586
171174510
181638724
192246594
203032025
214033918
225298001
236876080
248828154
2511221516
2614133153
2717648642
2821864897
2926888831
3032840460
3139851308

[2,15,87,371,1185,3186,7425,15658,30368,55222,
 95087,156612,248194,380753,567639,825586,1174510,
 1638724,2246594,3032025,4033918,5298001,6876080,
 8828154,11221516,14133153,17648642,21864897,
 26888831,32840460,39851308]