A047830 - OEIS

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A047830 as a simple table

n	a(n)
0	2
1	4
2	14
3	26
4	62
5	134
6	393
7	1774
8	13682
9	41037
10	167073
11	334142
12	4677862
13	14033577
14	79464886
15	476789307
16	3488435822
17	34884358195

[2,4,14,26,62,134,393,1774,13682,41037,167073, 334142,4677862,14033577,79464886,476789307, 3488435822,34884358195]