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A037765 as a simple table

na(n)
13
212
350
4201
5807
63228
712914
851657
9206631
10826524
113306098
1213224393
1352897575
14211590300
15846361202
163385444809
1713541779239
1854167116956
19216668467826
20866673871305
213466695485223
2213866781940892
2355467127763570

[3,12,50,201,807,3228,12914,51657,206631,826524,
 3306098,13224393,52897575,211590300,846361202,
 3385444809,13541779239,54167116956,216668467826,
 866673871305,3466695485223,13866781940892,
 55467127763570]