A054946 - OEIS

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A054946 as a simple table

n	a(n)
1	1
2	0
3	2
4	24
5	544
6	22320
7	1677488
8	236522496
9	64026088576
10	33832910196480
11	35262092417856512
12	72926863133112198144
13	300318571786159783496704
14	2467430973323656141183549440
15	40490606137578335674252914280448

[1,0,2,24,544,22320,1677488,236522496,64026088576, 33832910196480,35262092417856512, 72926863133112198144,300318571786159783496704, 2467430973323656141183549440, 40490606137578335674252914280448]