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A128650 as a simple table

na(n)
20
34
416
560
6224
7840
83168
912012
1045760
11175032
12671840
132586584
149984576
1538630800
16149768640
17581690700
182262890880
198815845720
2034389986400
21134312002440
22525129633600
232055166429680
248050465600320
2531561484455800

[0,4,16,60,224,840,3168,12012,45760,175032,671840,
 2586584,9984576,38630800,149768640,581690700,
 2262890880,8815845720,34389986400,134312002440,
 525129633600,2055166429680,8050465600320,
 31561484455800]