A019092 - OEIS

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A019092 as a simple table

n	a(n)
3	0
4	1
5	1
6	0
7	3
8	0
9	7
10	4
11	42
12	63
13	245
14	469
15	1392
16	2850
17	7536
18	15797
19	41646
20	90054
21	236923
22	532734
23	1388279
24	3215046
25	8251196
26	19482154
27	49498130
28	118495071
29	299326350
30	724425383
31	1825167876

[0,1,1,0,3,0,7,4,42,63,245,469,1392,2850,7536, 15797,41646,90054,236923,532734,1388279,3215046, 8251196,19482154,49498130,118495071,299326350, 724425383,1825167876]