A143916 - OEIS

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A143916 as a simple table

n	a(n)
0	1
1	1
2	1
3	3
4	12
5	62
6	385
7	2781
8	22848
9	210176
10	2139336
11	23872450
12	289825228
13	3803859030
14	53676793157
15	810508456373
16	13041332257860
17	222776899815744
18	4026846590787586
19	76792054455516582
20	1540845309830989064

[1,1,1,3,12,62,385,2781,22848,210176,2139336, 23872450,289825228,3803859030,53676793157, 810508456373,13041332257860,222776899815744, 4026846590787586,76792054455516582, 1540845309830989064]