A221271 - OEIS

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A221271 as a simple table

n	a(n)
1	0
2	16
3	0
4	596
5	0
6	24366
7	0
8	1001855
9	0
10	41171316
11	0
12	1691327788
13	0
14	69470653170
15	0
16	2853337539621
17	0
18	117191717993760
19	0
20	4813242705044572
21	0
22	197686734633818238
23	0
24	8119268451165592095
25	0

[0,16,0,596,0,24366,0,1001855,0,41171316,0, 1691327788,0,69470653170,0,2853337539621,0, 117191717993760,0,4813242705044572,0, 197686734633818238,0,8119268451165592095,0]