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A217986 as a simple table

na(n)
1560
21000
310200
45670
563945
6158400
7322920
8140800
91200420
10889200
11792064
124706352
136331446
1412042800
151000350
168429960
17101892288
18129600900
19365575680
20340692480
21264269250
22304646400
23511999488
24118857024

[560,1000,10200,5670,63945,158400,322920,140800,
 1200420,889200,792064,4706352,6331446,12042800,
 1000350,8429960,101892288,129600900,365575680,
 340692480,264269250,304646400,511999488,118857024]