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A269673 as a simple table

na(n)
14
216
360
4224
5820
62976
710700
838224
9135780
10480176
111691740
125941824
1320814740
1472755776
15253836780
16884207024
173075861700
1810687549776
1937098781820
20128668433824
21445930140660
221544500542176
235346546062860
2418499277662224

[4,16,60,224,820,2976,10700,38224,135780,480176,
 1691740,5941824,20814740,72755776,253836780,
 884207024,3075861700,10687549776,37098781820,
 128668433824,445930140660,1544500542176,
 5346546062860,18499277662224]