A019095 - OEIS

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A019095 as a simple table

n	a(n)
3	0
4	1
5	2
6	6
7	10
8	30
9	42
10	126
11	308
12	688
13	1436
14	3536
15	7261
16	18323
17	42046
18	104611
19	256824
20	658364
21	1658724
22	4386555
23	11337498
24	30272771
25	79610468
26	212690656
27	562612764
28	1499043449
29	3965697029
30	10529372555

[0,1,2,6,10,30,42,126,308,688,1436,3536,7261, 18323,42046,104611,256824,658364,1658724,4386555, 11337498,30272771,79610468,212690656,562612764, 1499043449,3965697029,10529372555]