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A010551 as a simple table

na(n)
01
11
21
32
44
512
636
7144
8576
92880
1014400
1186400
12518400
133628800
1425401600
15203212800
161625702400
1714631321600
18131681894400
191316818944000
2013168189440000
21144850083840000
221593350922240000
2319120211066880000
24229442532802560000
252982752926433280000

[1,1,1,2,4,12,36,144,576,2880,14400,86400,518400,
 3628800,25401600,203212800,1625702400,14631321600,
 131681894400,1316818944000,13168189440000,
 144850083840000,1593350922240000,
 19120211066880000,229442532802560000,
 2982752926433280000]