A339739 - OEIS

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A339739 as a simple table

n	a(n)
1	0
2	0
3	0
4	1
5	4
6	11
7	30
8	78
9	205
10	546
11	1455
12	4062
13	11192
14	31889
15	88487
16	254594
17	710683
18	2047705
19	5711439
20	16455169
21	45894868
22	132118562
23	368149344
24	1059171430
25	2950384277
26	8484556353

[0,0,0,1,4,11,30,78,205,546,1455,4062,11192,31889, 88487,254594,710683,2047705,5711439,16455169, 45894868,132118562,368149344,1059171430, 2950384277,8484556353]