A252923 - OEIS

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A252923 as a simple table

n	a(n)
1	0
2	0
3	1
4	615
5	84910
6	8241540
7	759337545
8	73117894428
9	7578889491370
10	848729993032718
11	102072779621746876
12	13069744040275286234
13	1766655687081261435255
14	250232365919081938956865
15	36910187948533534644694094

[0,0,1,615,84910,8241540,759337545,73117894428, 7578889491370,848729993032718,102072779621746876, 13069744040275286234,1766655687081261435255, 250232365919081938956865, 36910187948533534644694094]