A293538 - OEIS

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A293538 as a simple table

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	10
7	20
8	34
9	43
10	70
11	85
12	138
13	205
14	574
15	1378
16	1512
17	1770
18	2434
19	3073
20	3330
21	29443
22	76840
23	122203
24	142932
25	176908

[0,1,2,4,5,10,20,34,43,70,85,138,205,574,1378, 1512,1770,2434,3073,3330,29443,76840,122203, 142932,176908]