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A156361 as a simple table

na(n)
01
16
242
3288
42016
514040
698280
7686880
84808160
933638976
10235472832
111647983232
1211535882624
1380745019776
14565215138432
153956385876480
1627694701135360
17193860506096640
181357023542676480
199499115800977408

[1,6,42,288,2016,14040,98280,686880,4808160,
 33638976,235472832,1647983232,11535882624,
 80745019776,565215138432,3956385876480,
 27694701135360,193860506096640,1357023542676480,
 9499115800977408]