A303407 - OEIS

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A303407 as a simple table

n	a(n)
1	3
2	27
3	100
4	547
5	4013
6	21361
7	115770
8	803911
9	4667376
10	27684643
11	182192785
12	1120872960
13	6916763577
14	44766799474
15	282088259954
16	1776639929407
17	11435967743483
18	72802740854480
19	463125006110247
20	2975736132751591

[3,27,100,547,4013,21361,115770,803911,4667376, 27684643,182192785,1120872960,6916763577, 44766799474,282088259954,1776639929407, 11435967743483,72802740854480,463125006110247, 2975736132751591]