A320437 - OEIS

A320437 as a simple table

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	0
6	0
7	2
8	0
9	0
10	0
11	2
12	4
13	2
14	12
15	22
16	26
17	10
18	58
19	218
20	314
21	218
22	726
23	2286
24	3434
25	2678
26	9766
27	30962
28	45680
29	40640
30	148162
31	468338
32	689264
33	683498
34	2518026
35	7794088
36	11554876
37	12462092
38	45335614
39	137227934
40	206599268
41	239436918
42	843541244

[1,0,0,0,0,0,0,2,0,0,0,2,4,2,12,22,26,10,58,218, 314,218,726,2286,3434,2678,9766,30962,45680,40640, 148162,468338,689264,683498,2518026,7794088, 11554876,12462092,45335614,137227934,206599268, 239436918,843541244]