A317787 - OEIS

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A317787 as a simple table

n	a(n)
1	1
2	1
3	2
4	4
5	8
6	18
7	40
8	95
9	227
10	557
11	1382
12	3485
13	8865
14	22790
15	59022
16	153972
17	404066
18	1066236
19	2826885
20	7527411
21	20121154

[1,1,2,4,8,18,40,95,227,557,1382,3485,8865,22790, 59022,153972,404066,1066236,2826885,7527411, 20121154]