A272762 - OEIS

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A272762 as a simple table

n	a(n)
0	1
1	5
2	25
3	105
4	417
5	1657
6	6689
7	27353
8	112513
9	462969
10	1899873
11	7766041
12	31617089
13	128250041
14	518623777
15	2091988569

[1,5,25,105,417,1657,6689,27353,112513,462969, 1899873,7766041,31617089,128250041,518623777, 2091988569]