A156361 - OEIS

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A156361 as a simple table

n	a(n)
0	1
1	6
2	42
3	288
4	2016
5	14040
6	98280
7	686880
8	4808160
9	33638976
10	235472832
11	1647983232
12	11535882624
13	80745019776
14	565215138432
15	3956385876480
16	27694701135360
17	193860506096640
18	1357023542676480
19	9499115800977408

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