A184937 - OEIS

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A184937 as a simple table

n	a(n)
0	3
1	6
2	19
3	65
4	231
5	840
6	3102
7	11583
8	43615
9	165308
10	629850
11	2410226
12	9256534
13	35659200
14	137733660
15	533216475
16	2068423695
17	8037976980
18	31285334850
19	121941160110
20	475898730450

[3,6,19,65,231,840,3102,11583,43615,165308,629850, 2410226,9256534,35659200,137733660,533216475, 2068423695,8037976980,31285334850,121941160110, 475898730450]