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A214724 as a simple table

na(n)
01
11
22
34
410
550
6220
71240
86140
932860
10602200
115668400
1262030200
13522328600
144487190800
1562591332000
16715163146000
1730496564010000
18482341877812000
198342949421288000
20124613700640580000
211733826182453140000
2236635355834463000000
23597186420007933040000

[1,1,2,4,10,50,220,1240,6140,32860,602200,5668400,
 62030200,522328600,4487190800,62591332000,
 715163146000,30496564010000,482341877812000,
 8342949421288000,124613700640580000,
 1733826182453140000,36635355834463000000,
 597186420007933040000]