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A291171 as a simple table

na(n)
12
24
36
48
510
611
713
815
917
1020
1122
1224
1326
1428
1529
1631
1733
1835

[2,4,6,8,10,11,13,15,17,20,22,24,26,28,29,31,33,
 35]