A269815 - OEIS

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A269815 as a simple table

n	a(n)
0	1
1	5
2	37
3	185
4	817
5	3425
6	14017
7	56705
8	228097
9	914945
10	3664897
11	14669825
12	58699777
13	234840065
14	939442177
15	3757932545

[1,5,37,185,817,3425,14017,56705,228097,914945, 3664897,14669825,58699777,234840065,939442177, 3757932545]