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A003731 as a simple table

na(n)
11
25
330
4160
5850
64520
724040
8127860
9680040
103616880
1119236840
12102313600
13544168000
142894227280
1515393318880
1681871340160
17435443220000
182315960597120
1912317733383040
2065513444349760
21348441653760640
221853231611930880
239856649945242240
2452423856531251200

[1,5,30,160,850,4520,24040,127860,680040,3616880,
 19236840,102313600,544168000,2894227280,
 15393318880,81871340160,435443220000,
 2315960597120,12317733383040,65513444349760,
 348441653760640,1853231611930880,9856649945242240,
 52423856531251200]