A237765 - OEIS

A237765 as a simple table

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	1
6	3
7	9
8	9
9	3
10	6
11	24
12	36
13	24
14	6
15	10
16	50
17	100
18	100
19	50
20	10
21	15
22	90
23	225
24	300
25	225
26	90
27	15
28	21
29	147
30	441
31	735
32	735
33	441
34	147
35	21
36	28
37	224
38	784
39	1568
40	1960
41	1568
42	784
43	224
44	28
45	36
46	324
47	1296
48	3024
49	4536
50	4536
51	3024
52	1296
53	324
54	36

[0,0,0,1,2,1,3,9,9,3,6,24,36,24,6,10,50,100,100, 50,10,15,90,225,300,225,90,15,21,147,441,735,735, 441,147,21,28,224,784,1568,1960,1568,784,224,28, 36,324,1296,3024,4536,4536,3024,1296,324,36]