A278074 - OEIS

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A278074 as a simple table

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	70
6	0
7	1
8	990
9	34650
10	0
11	1
12	16510
13	2702700
14	63063000
15	0
16	1
17	261630
18	213519150
19	17459442000
20	305540235000
21	0
22	1
23	4196350
24	17651304000
25	4350310965000
26	231905038365000
27	3246670537110000

[1,0,1,0,1,70,0,1,990,34650,0,1,16510,2702700, 63063000,0,1,261630,213519150,17459442000, 305540235000,0,1,4196350,17651304000, 4350310965000,231905038365000,3246670537110000]