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A331392 as a simple table

na(n)
10
22
34
412
524
660
7120
8264
9528
101116
112232
124584
139168
1418616
1537232
1675056
17150112
18301556
19603112
201209064
212418128
224842504
239685008
2419383408
2538766816
2677562648
27155125296
28310312528
29620625056
301241382832
312482765664
324965813280
339931626560

[0,2,4,12,24,60,120,264,528,1116,2232,4584,9168,
 18616,37232,75056,150112,301556,603112,1209064,
 2418128,4842504,9685008,19383408,38766816,
 77562648,155125296,310312528,620625056,1241382832,
 2482765664,4965813280,9931626560]