A336742 - OEIS

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A336742 as a simple table

n	a(n)
0	1
1	0
2	1
3	1
4	2
5	6
6	17
7	49
8	156
9	520
10	1762
11	6110
12	21713
13	78469
14	287393
15	1065951
16	3998286
17	15140500
18	57817817
19	222478829
20	861952579
21	3360043843
22	13171307962

[1,0,1,1,2,6,17,49,156,520,1762,6110,21713,78469, 287393,1065951,3998286,15140500,57817817, 222478829,861952579,3360043843,13171307962]