A174613 - OEIS

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A174613 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	1
7	3
8	27
9	146
10	492
11	1336
12	3156
13	7082
14	14938
15	29282
16	55012
17	100707
18	178063
19	306310
20	514381
21	846627
22	1370257

[0,0,0,0,0,0,1,3,27,146,492,1336,3156,7082,14938, 29282,55012,100707,178063,306310,514381,846627, 1370257]