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A209738 as a simple table

na(n)
12
26
357
4700
510594
6183240
73412100
865953664
91298076552
1025767620512
11513555943312
1210254450363264
13204934235829536
144097247120151424
1581931587030997056
161638507658307430400
1732769000295781617792

[2,6,57,700,10594,183240,3412100,65953664,
 1298076552,25767620512,513555943312,
 10254450363264,204934235829536,4097247120151424,
 81931587030997056,1638507658307430400,
 32769000295781617792]