A135527 - OEIS

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A135527 as a simple table

n	a(n)
1	1
2	1
3	2
4	4
5	11
6	30
7	96
8	319
9	1135
10	4150
11	15690
12	60506
13	237853
14	948455
15	3831226
16	15642947
17	64484774
18	268055006
19	1122646262
20	4733357618
21	20078203381
22	85637471487
23	367093826598
24	1580813221552
25	6836181195493

[1,1,2,4,11,30,96,319,1135,4150,15690,60506, 237853,948455,3831226,15642947,64484774,268055006, 1122646262,4733357618,20078203381,85637471487, 367093826598,1580813221552,6836181195493]