A024506 - OEIS

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A024506 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	1
7	3
8	6
9	11
10	22
11	43
12	82
13	158
14	306
15	591
16	1146
17	2225
18	4327
19	8426
20	16432
21	32082
22	62707
23	122687
24	240263
25	470916
26	923720
27	1813228
28	3561699
29	7000581
30	13767809

[0,0,0,0,0,0,1,3,6,11,22,43,82,158,306,591,1146, 2225,4327,8426,16432,32082,62707,122687,240263, 470916,923720,1813228,3561699,7000581,13767809]