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A123485 as a simple table

na(n)
10
20
30
42520
51814400
61888563600
72979953776800
86935468956416000
923019567930463104000
10105689740661883810432000
11653795414851090462030080000
125326203537908913517889391360000

[0,0,0,2520,1814400,1888563600,2979953776800,
 6935468956416000,23019567930463104000,
 105689740661883810432000,
 653795414851090462030080000,
 5326203537908913517889391360000]