A185858 - OEIS

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A185858 as a simple table

n	a(n)
1	4
2	22
3	124
4	694
5	3892
6	21814
7	122284
8	685462
9	3842404
10	21538774
11	120736732
12	676795894
13	3793814164
14	21266419702
15	119210006284
16	668237802454
17	3745841266372
18	20997505287574
19	117702592547644
20	659787917778742

[4,22,124,694,3892,21814,122284,685462,3842404, 21538774,120736732,676795894,3793814164, 21266419702,119210006284,668237802454, 3745841266372,20997505287574,117702592547644, 659787917778742]