A162359 - OEIS

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A162359 as a simple table

n	a(n)
0	1
1	20
2	209
3	1520
4	8644
5	40944
6	168035
7	613756
8	2034120
9	6206596
10	17632836
11	47062620
12	118870650
13	285840940
14	657667521
15	1454009144
16	3100176535
17	6394814820
18	12796122680
19	24898749084
20	47210910669
21	87394933080

[1,20,209,1520,8644,40944,168035,613756,2034120, 6206596,17632836,47062620,118870650,285840940, 657667521,1454009144,3100176535,6394814820, 12796122680,24898749084,47210910669,87394933080]