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A000303 as a simple table

na(n)
10
21
34
416
569
6348
72016
813357
999376
10822040
117477161
1274207208
13797771520
149236662345
15114579019468
161516103040832
1721314681315997
18317288088082404
194985505271920096
2082459612672301845
211432064398910663704
2226054771465540507272

[0,1,4,16,69,348,2016,13357,99376,822040,7477161,
 74207208,797771520,9236662345,114579019468,
 1516103040832,21314681315997,317288088082404,
 4985505271920096,82459612672301845,
 1432064398910663704,26054771465540507272]