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A328551 as a simple table

na(n)
10
20
30
4666
536975
6437517
72667375
811225145
937206936
10104285790
11257991042
12579308220
131203756165
142347234131
154340067705
167670818467
1713041558390
1821436446060
1934205577876
2053166223470
2180723690667
22120014201385
23175072295955
24251025419421

[0,0,0,666,36975,437517,2667375,11225145,37206936,
 104285790,257991042,579308220,1203756165,
 2347234131,4340067705,7670818467,13041558390,
 21436446060,34205577876,53166223470,80723690667,
 120014201385,175072295955,251025419421]