A022619 - OEIS

A022619 as a simple table

n	a(n)
1	0
2	1
3	0
4	0
5	1
6	0
7	1
8	0
9	0
10	1
11	0
12	7
13	7
14	7
15	0
16	1
17	0
18	0
19	1
20	0
21	35
22	105
23	273
24	448
25	715
26	750
27	715
28	448
29	273
30	105
31	35
32	0
33	1
34	0
35	0
36	1
37	0
38	155
39	1085
40	6293
41	27776
42	105183
43	327050
44	876525
45	2011776
46	4032015
47	7048811
48	10855425
49	14721280
50	17678835
51	18771864

[0,1,0,0,1,0,1,0,0,1,0,7,7,7,0,1,0,0,1,0,35,105, 273,448,715,750,715,448,273,105,35,0,1,0,0,1,0, 155,1085,6293,27776,105183,327050,876525,2011776, 4032015,7048811,10855425,14721280,17678835, 18771864]