A273836 - OEIS

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A273836 as a simple table

n	a(n)
0	1
1	5
2	17
3	61
4	277
5	1061
6	4241
7	18749
8	77869
9	327061
10	1355757
11	5533821
12	22419573
13	90547821
14	363913981
15	1459594693

[1,5,17,61,277,1061,4241,18749,77869,327061, 1355757,5533821,22419573,90547821,363913981, 1459594693]