A205975 - OEIS

A205975 as a simple table

n	a(n)
0	1
1	2
2	4
3	0
4	18
5	0
6	0
7	26
8	168
9	68
10	0
11	356
12	0
13	0
14	1508
15	0
16	9870
17	0
18	10336
19	0
20	0
21	0
22	141688
23	114628
24	0
25	150050
26	0
27	0
28	1906866
29	2056916
30	0
31	0
32	26139708
33	0
34	0
35	0
36	89582112
37	96631268
38	0
39	0
40	0
41	0
42	0
43	1733977748
44	8416904796
45	0
46	14690495224
47	0
48	0
49	15557484098

[1,2,4,0,18,0,0,26,168,68,0,356,0,0,1508,0,9870,0, 10336,0,0,0,141688,114628,0,150050,0,0,1906866, 2056916,0,0,26139708,0,0,0,89582112,96631268,0,0, 0,0,0,1733977748,8416904796,0,14690495224,0,0, 15557484098]