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A230615 as a simple table

na(n)
10
20
30
430
5260
62358
720430
8176774
91527918
1013204026
11114099558
12985963206
138519922122
1473622499446
15636187953758
165497437822074
1747504550336526
18410497104019406
193547194348471034
2030652074338152030
21264871210587660230

[0,0,0,30,260,2358,20430,176774,1527918,13204026,
 114099558,985963206,8519922122,73622499446,
 636187953758,5497437822074,47504550336526,
 410497104019406,3547194348471034,
 30652074338152030,264871210587660230]