A019067 - OEIS

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A019067 as a simple table

n	a(n)
3	0
4	0
5	4
6	5
7	6
8	31
9	64
10	139
11	378
12	744
13	1698
14	4181
15	8772
16	20390
17	48362
18	110784
19	267832
20	655285
21	1620786
22	4118867
23	10563612
24	27476768
25	72198838
26	190698257
27	506006608
28	1345521862
29	3579314908
30	9520710621

[0,0,4,5,6,31,64,139,378,744,1698,4181,8772,20390, 48362,110784,267832,655285,1620786,4118867, 10563612,27476768,72198838,190698257,506006608, 1345521862,3579314908,9520710621]