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A206981 as a simple table

na(n)
14
216
336
4100
5256
6676
71764
84624
912100
1031684
1182944
12217156
13568516
141488400
153896676
1610201636
1726708224
1869923044
19183060900
20479259664
211254718084
223284894596
238599965696
2422515002500
2558945041796
26154320122896
27404015326884

[4,16,36,100,256,676,1764,4624,12100,31684,82944,
 217156,568516,1488400,3896676,10201636,26708224,
 69923044,183060900,479259664,1254718084,
 3284894596,8599965696,22515002500,58945041796,
 154320122896,404015326884]