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A156438 as a simple table

na(n)
22
30
422
57
6232
7270
89312
940416
101578064
1110491480
12534495232
134186295040
14266388662656
152380048630848
16182963339479264
171839487795001024
18166774503916789696
191865501254974930048
20195842622547532763968

[2,0,22,7,232,270,9312,40416,1578064,10491480,
 534495232,4186295040,266388662656,2380048630848,
 182963339479264,1839487795001024,
 166774503916789696,1865501254974930048,
 195842622547532763968]