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A123689 as a simple table

na(n)
10
22
34
410
516
626
732
846
960
1074
1188
12108
13124
14146
15172
16194
17216
18248
19276
20308

[0,2,4,10,16,26,32,46,60,74,88,108,124,146,172,
 194,216,248,276,308]