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A204322 as a simple table

na(n)
10
22
36
418
550
6290
72582
820462
923870
1026342
1131938
1238122
1365034
1470130
15245538
16851878
171052422
181496566
195380542
208431178

[0,2,6,18,50,290,2582,20462,23870,26342,31938,
 38122,65034,70130,245538,851878,1052422,1496566,
 5380542,8431178]