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A198710 as a simple table

na(n)
12
225
3401
46548
5107042
61749965
728609241
8467717288
97646461682
10125007943505
112043688517681
1233411178843628
13546221629207922
148929887496964645
15145989990956749721
162386712874803449568
1739019101990629849762

[2,25,401,6548,107042,1749965,28609241,467717288,
 7646461682,125007943505,2043688517681,
 33411178843628,546221629207922,8929887496964645,
 145989990956749721,2386712874803449568,
 39019101990629849762]