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A053500 as a simple table

na(n)
01
11
22
34
410
550
6220
71240
86140
932860
10602200
115668400
1262030200
13522328600
144487190800
1562591332000
16715163146000
179573774122000
18105731659828000
191187355279592000
2029205778751300000
21481597207656340000
229086318388933400000
23132525988426667120000

[1,1,2,4,10,50,220,1240,6140,32860,602200,5668400,
 62030200,522328600,4487190800,62591332000,
 715163146000,9573774122000,105731659828000,
 1187355279592000,29205778751300000,
 481597207656340000,9086318388933400000,
 132525988426667120000]