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A340521 as a simple table

na(n)
11
22
34
46
58
610
712
816
918
1020
1122
1224
1328
1430
1532
1636
1740
1842
1944
2046
2148
2252
2354
2456
2558
2660

[1,2,4,6,8,10,12,16,18,20,22,24,28,30,32,36,40,42,
 44,46,48,52,54,56,58,60]