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A375226 as a simple table

na(n)
01
12
26
330
4240
52520
630600
7413280
86168960
9101666880
101842825600
1136483955200
12782548905600
1318048500870400
14444816333561600
1511656620213638400
16323500679915212800
179475966585948262400
18292101319958063616000
199450373008137757696000

[1,2,6,30,240,2520,30600,413280,6168960,101666880,
 1842825600,36483955200,782548905600,
 18048500870400,444816333561600,11656620213638400,
 323500679915212800,9475966585948262400,
 292101319958063616000,9450373008137757696000]