A238287 - OEIS

A238287 as a simple table

n	a(n)
1	4
2	16
3	16
4	50
5	204
6	50
7	144
8	1844
9	1844
10	144
11	422
12	13948
13	42084
14	13948
15	422
16	1268
17	105862
18	737366
19	737366
20	105862
21	1268
22	3823
23	850420
24	12926271
25	27913368
26	12926271
27	850420
28	3823
29	11472
30	6953993
31	245920800
32	1058583000
33	1058583000
34	245920800

[4,16,16,50,204,50,144,1844,1844,144,422,13948, 42084,13948,422,1268,105862,737366,737366,105862, 1268,3823,850420,12926271,27913368,12926271, 850420,3823,11472,6953993,245920800,1058583000, 1058583000,245920800]