A178854 - OEIS

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A178854 as a simple table

n	a(n)
0	0
1	1
2	1
3	5
4	13
5	29
6	29
7	93
8	221
9	221
10	733
11	1757
12	3805
13	7901
14	7901
15	24285
16	57053
17	122589
18	122589
19	384733
20	384733
21	384733
22	2481885
23	2481885
24	10870493
25	10870493
26	10870493
27	10870493
28	145088221

[0,1,1,5,13,29,29,93,221,221,733,1757,3805,7901, 7901,24285,57053,122589,122589,384733,384733, 384733,2481885,2481885,10870493,10870493,10870493, 10870493,145088221]