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A159553 as a simple table

na(n)
12
26
312
428
540
6144
7140
8536
9864
102560
112068
1212720
138216
1445192
1578660
16182832
17131104
18933984
19524324
203698240
214890648
2213345816
238388652
2467390464
2560129600
26225470544
27279938160
281032462256
29536870968
305018059200

[2,6,12,28,40,144,140,536,864,2560,2068,12720,
 8216,45192,78660,182832,131104,933984,524324,
 3698240,4890648,13345816,8388652,67390464,
 60129600,225470544,279938160,1032462256,536870968,
 5018059200]