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A289706 as a simple table

na(n)
10
20
324
4324
51692
65796
715516
835388
971988
10134460
11234972
12389304
13617400
14943992
151399272
162019528
172847960
183935304
195340816
207132860
219390084
2212201948
2315670116
2419908900
2525046892
2631227300
2738609844
2847370960
2957705984
3069829200
3183976336
32100404432

[0,0,24,324,1692,5796,15516,35388,71988,134460,
 234972,389304,617400,943992,1399272,2019528,
 2847960,3935304,5340816,7132860,9390084,12201948,
 15670116,19908900,25046892,31227300,38609844,
 47370960,57705984,69829200,83976336,100404432]