A272839 - OEIS

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A272839 as a simple table

n	a(n)
0	1
1	5
2	29
3	149
4	661
5	2757
6	11229
7	45285
8	181837
9	728693
10	2917405
11	11674821
12	46709613
13	186859029
14	747477181
15	2989990757

[1,5,29,149,661,2757,11229,45285,181837,728693, 2917405,11674821,46709613,186859029,747477181, 2989990757]