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A000775 as a simple table

na(n)
01
14
212
346
4220
51268
68568
766456
8582048
95681952
1061174080
11720089280
129199906560
13126783809280
141874605662720
1529601115891200
16497155992883200
178849184886886400
18166399076525875200
193296032301811916800
2068596838245232640000
211496490349337948160000

[1,4,12,46,220,1268,8568,66456,582048,5681952,
 61174080,720089280,9199906560,126783809280,
 1874605662720,29601115891200,497155992883200,
 8849184886886400,166399076525875200,
 3296032301811916800,68596838245232640000,
 1496490349337948160000]