A012719 - OEIS

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A012719 as a simple table

n	a(n)
0	1
1	0
2	1
3	6
4	37
5	260
6	2365
7	24850
8	301033
9	4051848
10	60901145
11	1003420638
12	18072389069
13	352027414284
14	7390186076949
15	166110699895530
16	3983896292586577
17	101488729722338064
18	2737830394817774257

[1,0,1,6,37,260,2365,24850,301033,4051848, 60901145,1003420638,18072389069,352027414284, 7390186076949,166110699895530,3983896292586577, 101488729722338064,2737830394817774257]