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A263598 as a simple table

na(n)
12
28
324
460
5160
6448
71232
83344
99120
1024960
1168224
12186304
13508928
141390592
153799296
1610379520
1728357120
1877473792
19211662848
20578272256
211579868160
224316282880
2311792306176
2432217174016
2588018952192
26240472260608

[2,8,24,60,160,448,1232,3344,9120,24960,68224,
 186304,508928,1390592,3799296,10379520,28357120,
 77473792,211662848,578272256,1579868160,
 4316282880,11792306176,32217174016,88018952192,
 240472260608]