A138764 - OEIS

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A138764 as a simple table

n	a(n)
0	1
1	2
2	16
3	248
4	5824
5	184512
6	7379200
7	356956672
8	20274442240
9	1322971320320
10	97542692798464
11	8020249539919872
12	727662513046159360
13	72215332738579824640
14	7782298855258810482688
15	905031449967822916026368

[1,2,16,248,5824,184512,7379200,356956672, 20274442240,1322971320320,97542692798464, 8020249539919872,727662513046159360, 72215332738579824640,7782298855258810482688, 905031449967822916026368]