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A199937 as a simple table

na(n)
14
212
336
4104
5302
6868
72490
87132
920424
1058418
11167036
12477412
131364340
143898236
1511138194
1631824012
1790926724
18259790792
19742259560
202120727868
216059178186
2217311798890
2349461883130
24141318491362
25403763748824

[4,12,36,104,302,868,2490,7132,20424,58418,167036,
 477412,1364340,3898236,11138194,31824012,90926724,
 259790792,742259560,2120727868,6059178186,
 17311798890,49461883130,141318491362,403763748824]