A056483 - OEIS

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A056483 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	10
10	10
11	65
12	65
13	350
14	349
15	1701
16	1700
17	7770
18	7760
19	34105
20	34095
21	145749
22	145685
23	611501
24	611435
25	2532530
26	2532180
27	10391735
28	10391395
29	42355950
30	42354239
31	171798901

[0,0,0,0,0,0,1,1,10,10,65,65,350,349,1701,1700, 7770,7760,34105,34095,145749,145685,611501,611435, 2532530,2532180,10391735,10391395,42355950, 42354239,171798901]