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A000261 as a simple table

na(n)
10
21
33
413
571
6465
73539
830637
9296967
103184129
1137401155
12477471021
136581134823
1497388068753
151539794649171
1625902759280525
17461904032857319
188702813980639617
19172743930157869827
203602826440828270029
2178768746000235327495
221801366114380914335441

[0,1,3,13,71,465,3539,30637,296967,3184129,
 37401155,477471021,6581134823,97388068753,
 1539794649171,25902759280525,461904032857319,
 8702813980639617,172743930157869827,
 3602826440828270029,78768746000235327495,
 1801366114380914335441]