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A060919 as a simple table

na(n)
14
28
320
460
5204
6748
72860
811180
944204
10175788
11701100
122800300
1311193004
1444755628
15178989740
16715893420
172863442604
1811453508268
1945813508780
20183252986540
21733009849004
222932035201708
2311728132418220
2446912512895660

[4,8,20,60,204,748,2860,11180,44204,175788,701100,
 2800300,11193004,44755628,178989740,715893420,
 2863442604,11453508268,45813508780,183252986540,
 733009849004,2932035201708,11728132418220,
 46912512895660]