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A319906 as a simple table

na(n)
10
28
331
486
5221
6581
71503
84149
911355
1031985
1190940
12261081
13756081
142208197
156483148
1619132652
1756714624
18168806741
19504209234

[0,8,31,86,221,581,1503,4149,11355,31985,90940,
 261081,756081,2208197,6483148,19132652,56714624,
 168806741,504209234]