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A207276 as a simple table

na(n)
14
216
358
4214
5788
62902
710686
839350
9144902
10533586
111964872
127235426
1326643664
1498112376
15361288084
161330403818
174899066416
1818040275760
1966431340558
20244626139148
21900808977386
223317130444708
2312214969725478
2444980288801238

[4,16,58,214,788,2902,10686,39350,144902,533586,
 1964872,7235426,26643664,98112376,361288084,
 1330403818,4899066416,18040275760,66431340558,
 244626139148,900808977386,3317130444708,
 12214969725478,44980288801238]