A113284 - OEIS

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A113284 as a simple table

n	a(n)
0	1
1	5
2	23
3	113
4	579
5	3047
6	16319
7	88489
8	484255
9	2668951
10	14793169
11	82372723
12	460436551
13	2582033519
14	14519686915
15	81845419777
16	462319557311
17	2616334071987
18	14830559353869
19	84189874112659
20	478559722392493

[1,5,23,113,579,3047,16319,88489,484255,2668951, 14793169,82372723,460436551,2582033519, 14519686915,81845419777,462319557311, 2616334071987,14830559353869,84189874112659, 478559722392493]