A300343 - OEIS

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A300343 as a simple table

n	a(n)
1	0
2	2
3	9
4	58
5	306
6	1371
7	5451
8	20316
9	73826
10	268227
11	988143
12	3710046
13	14186486
14	55056941
15	215998713
16	853659146
17	3389857782
18	13500951049
19	53867577061

[0,2,9,58,306,1371,5451,20316,73826,268227,988143, 3710046,14186486,55056941,215998713,853659146, 3389857782,13500951049,53867577061]