A319283 - OEIS

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A319283 as a simple table

n	a(n)
0	1
1	2
2	3
3	6
4	17
5	54
6	153
7	552
8	2057
9	8394
10	35539
11	166926
12	856189
13	4674890
14	27358553
15	171129072
16	1141190303
17	8017021932
18	59365844491
19	461939618824

[1,2,3,6,17,54,153,552,2057,8394,35539,166926, 856189,4674890,27358553,171129072,1141190303, 8017021932,59365844491,461939618824]