A046714 - OEIS

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A046714 as a simple table

n	a(n)
0	1
1	6
2	32
3	165
4	839
5	4237
6	21317
7	107014
8	536500
9	2687362
10	13453606
11	67326816
12	336842092
13	1684953360
14	8427441240
15	42146901045
16	210769862895
17	1053978959265
18	5270372435025
19	26353629438315
20	131774711311995

[1,6,32,165,839,4237,21317,107014,536500,2687362, 13453606,67326816,336842092,1684953360,8427441240, 42146901045,210769862895,1053978959265, 5270372435025,26353629438315,131774711311995]