A020050 - OEIS

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A020050 as a simple table

n	a(n)
0	1
1	0
2	1
3	5
4	19
5	96
6	572
7	3955
8	31285
9	278720
10	2761871
11	30129503
12	358814994
13	4631975383
14	64426566694
15	960541539816
16	15281342678896
17	258393612570434
18	4627594697852333
19	87503608832116847
20	1742117303112144502

[1,0,1,5,19,96,572,3955,31285,278720,2761871, 30129503,358814994,4631975383,64426566694, 960541539816,15281342678896,258393612570434, 4627594697852333,87503608832116847, 1742117303112144502]