A060178 - OEIS

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A060178 as a simple table

n	a(n)
1	0
2	2
3	6
4	36
5	260
6	1860
7	18732
8	162176
9	1774656
10	20909160
11	320781560
12	4493532912
13	72263548656
14	1081552065776
15	16682494491600
16	315573151180800
17	7042434106860032
18	151228601744085216
19	3306518316205792416

[0,2,6,36,260,1860,18732,162176,1774656,20909160, 320781560,4493532912,72263548656,1081552065776, 16682494491600,315573151180800,7042434106860032, 151228601744085216,3306518316205792416]