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A006417 as a simple table

na(n)
21
320
4131
5469
61262
72862
85780
910725
1018647
1130784
1248713
1374405
14110284
15159290
16224946
17311429
18423645
19567308
20749023
21976373
221258010
231603750
242024672
252533221
263143315
273870456
284731845
295746501
306935384
318321522
329930142
3311788805
3413927545
3516379012

[1,20,131,469,1262,2862,5780,10725,18647,30784,
 48713,74405,110284,159290,224946,311429,423645,
 567308,749023,976373,1258010,1603750,2024672,
 2533221,3143315,3870456,4731845,5746501,6935384,
 8321522,9930142,11788805,13927545,16379012]