A162477 - OEIS

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A162477 as a simple table

n	a(n)
0	1
1	3
2	11
3	50
4	255
5	1391
6	7939
7	46821
8	283081
9	1745212
10	10929625
11	69338213
12	444668749
13	2877994064
14	18774736487
15	123321704739
16	814930698217
17	5413955476648
18	36138368789601
19	242252716083298
20	1630170332414433

[1,3,11,50,255,1391,7939,46821,283081,1745212, 10929625,69338213,444668749,2877994064, 18774736487,123321704739,814930698217, 5413955476648,36138368789601,242252716083298, 1630170332414433]