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A139480 as a simple table

na(n)
20
32
44
510
614
716
828
958
1086
11104
12124
13518
14604
151276
162200
172278
183214
194250
204420
219686
229938
2311210
2419934
2521698
2623206
2744494
2886240
29110500
30132046
31216088
32756836
33859430
341257784
351398266
362976218
373021374
386972590
3913466914
4020996008
4124036580
4225964948

[0,2,4,10,14,16,28,58,86,104,124,518,604,1276,
 2200,2278,3214,4250,4420,9686,9938,11210,19934,
 21698,23206,44494,86240,110500,132046,216088,
 756836,859430,1257784,1398266,2976218,3021374,
 6972590,13466914,20996008,24036580,25964948]