A034623 - OEIS

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A034623 as a simple table

n	a(n)
0	1
1	0
2	0
3	21840
4	663390
5	9552816
6	85700160
7	545117040
8	2698670520
9	11108413680
10	39378830400
11	123279090480
12	350616550830
13	917656568640
14	2226379296960
15	5103442680336
16	11083979161710
17	22885299178560

[1,0,0,21840,663390,9552816,85700160,545117040, 2698670520,11108413680,39378830400,123279090480, 350616550830,917656568640,2226379296960, 5103442680336,11083979161710,22885299178560]