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A014480 as a simple table

na(n)
01
16
220
356
4144
5352
6832
71920
84352
99728
1021504
1147104
12102400
13221184
14475136
151015808
162162688
174587520
189699328
1920447232
2042991616
2190177536
22188743680
23394264576
24822083584
251711276032
263556769792
277381975040
2815300820992

[1,6,20,56,144,352,832,1920,4352,9728,21504,47104,
 102400,221184,475136,1015808,2162688,4587520,
 9699328,20447232,42991616,90177536,188743680,
 394264576,822083584,1711276032,3556769792,
 7381975040,15300820992]