A243920 - OEIS

A243920 as a simple table

n	a(n)
0	0
1	1
2	0
3	1
4	3
5	0
6	4
7	3
8	5
9	0
10	27
11	18
12	5
13	7
14	0
15	254
16	159
17	40
18	7
19	9
20	0
21	3048
22	1836
23	435
24	70
25	9
26	11
27	0
28	44328
29	26028
30	5930
31	903
32	108
33	11
34	13
35	0
36	755681
37	435804
38	96640
39	14168
40	1611
41	154
42	13
43	15
44	0
45	14750646
46	8395065
47	1825600
48	260484
49	28566
50	2607
51	208
52	15
53	17
54	0
55	323999500

[0,1,0,1,3,0,4,3,5,0,27,18,5,7,0,254,159,40,7,9,0, 3048,1836,435,70,9,11,0,44328,26028,5930,903,108, 11,13,0,755681,435804,96640,14168,1611,154,13,15, 0,14750646,8395065,1825600,260484,28566,2607,208, 15,17,0,323999500]