A272921 - OEIS

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A272921 as a simple table

n	a(n)
0	1
1	5
2	29
3	149
4	669
5	2837
6	11709
7	47669
8	192669
9	775637
10	3115389
11	12495989
12	50079069
13	200585237
14	803115069
15	3214717109

[1,5,29,149,669,2837,11709,47669,192669,775637, 3115389,12495989,50079069,200585237,803115069, 3214717109]