A012258 - OEIS

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A012258 as a simple table

n	a(n)
0	1
1	1
2	1
3	4
4	13
5	84
6	469
7	4152
8	32985
9	370128
10	3818601
11	51861888
12	658371429
13	10494283968
14	158197312701
15	2894815734912
16	50529852678321
17	1043916757274880
18	20707179214389201
19	476720372375608320

[1,1,1,4,13,84,469,4152,32985,370128,3818601, 51861888,658371429,10494283968,158197312701, 2894815734912,50529852678321,1043916757274880, 20707179214389201,476720372375608320]