A041794 - OEIS

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A041794 as a simple table

n	a(n)
0	20
1	41
2	184
3	3721
4	15068
5	33857
6	1369348
7	2772553
8	12459560
9	251963753
10	1020314572
11	2292592897
12	92724030452
13	187740653801
14	843686645656
15	17061473566921
16	69089580913340
17	155240635393601
18	6278714996657380

[20,41,184,3721,15068,33857,1369348,2772553, 12459560,251963753,1020314572,2292592897, 92724030452,187740653801,843686645656, 17061473566921,69089580913340,155240635393601, 6278714996657380]