A019115 - OEIS

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A019115 as a simple table

n	a(n)
3	0
4	0
5	6
6	0
7	3
8	39
9	39
10	105
11	378
12	594
13	1344
14	4092
15	9150
16	22374
17	60696
18	150426
19	377184
20	985650
21	2552319
22	6634257
23	17457894
24	46069254
25	121788231
26	323097138
27	860451210
28	2297043408
29	6143371473
30	16474006986

[0,0,6,0,3,39,39,105,378,594,1344,4092,9150,22374, 60696,150426,377184,985650,2552319,6634257, 17457894,46069254,121788231,323097138,860451210, 2297043408,6143371473,16474006986]