A003211 - OEIS

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A003211 as a simple table

n	a(n)
0	1
1	6
2	30
3	114
4	438
5	1542
6	5754
7	19574
8	71958
9	233574
10	870666
11	2696274
12	10375770
13	30198116
14	122634404
15	327024444
16	1460721616
17	3347244554
18	17795165832

[1,6,30,114,438,1542,5754,19574,71958,233574, 870666,2696274,10375770,30198116,122634404, 327024444,1460721616,3347244554,17795165832]