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A139115 as a simple table

na(n)
12
26
320
442
5156
6272
7342
8930
93660
107832
1111342
1216002
13270920
14367842
151634562
164851006
175200680
1810345872
1918083756
2019558506
2193867032
2298813540
23125720156
24397464032
25470911700
26538634472
271979938512
287437768806
2912210802506

[2,6,20,42,156,272,342,930,3660,7832,11342,16002,
 270920,367842,1634562,4851006,5200680,10345872,
 18083756,19558506,93867032,98813540,125720156,
 397464032,470911700,538634472,1979938512,
 7437768806,12210802506]