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A146980 as a simple table

na(n)
18
224
348
480
5168
6224
7360
8440
9728
10840
111088
121224
131368
141848
152208
162400
173024
183720
193968
204760
215040
225624
235928
247920
258648
2610608
2711448
2813688
2914160
3014640
3116128
3217160
3318224
3419320
3521024
3624024
3725920
3828560
3929928
4031328
4133488

[8,24,48,80,168,224,360,440,728,840,1088,1224,
 1368,1848,2208,2400,3024,3720,3968,4760,5040,5624,
 5928,7920,8648,10608,11448,13688,14160,14640,
 16128,17160,18224,19320,21024,24024,25920,28560,
 29928,31328,33488]