A055599 - OEIS

A055599 as a simple table

n	a(n)
1	0
2	1
3	0
4	0
5	2
6	4
7	1
8	0
9	0
10	0
11	6
12	45
13	90
14	78
15	36
16	9
17	1
18	0
19	0
20	0
21	0
22	24
23	432
24	2248
25	5776
26	9066
27	9696
28	7480
29	4272
30	1812
31	560
32	120
33	16
34	1
35	0
36	0
37	0
38	0
39	0
40	120
41	4200
42	43000
43	222925
44	727375
45	1674840
46	2913100
47	3995100
48	4441200
49	4073100
50	3114140
51	1994550

[0,1,0,0,2,4,1,0,0,0,6,45,90,78,36,9,1,0,0,0,0,24, 432,2248,5776,9066,9696,7480,4272,1812,560,120,16, 1,0,0,0,0,0,120,4200,43000,222925,727375,1674840, 2913100,3995100,4441200,4073100,3114140,1994550]