A005673 - OEIS

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A005673 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	2
6	6
7	11
8	24
9	42
10	81
11	138
12	250
13	419
14	732
15	1214
16	2073
17	3414
18	5742
19	9411
20	15664
21	25586
22	42273
23	68882
24	113202
25	184131
26	301428
27	489654
28	799273
29	1297118
30	2112774

[0,0,0,0,1,2,6,11,24,42,81,138,250,419,732,1214, 2073,3414,5742,9411,15664,25586,42273,68882, 113202,184131,301428,489654,799273,1297118, 2112774]