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A009049 as a simple table

na(n)
01
10
20
30
4-12
560
6-210
71260
8-8400
954432
10-456360
114469520
12-45154296
13493288224
14-5892938688
1575085701600
16-1017515316480
1714668694264704
18-223340767219392
193570533188036992
20-59698808359690112
211038791996385239040

[1,0,0,0,-12,60,-210,1260,-8400,54432,-456360,
 4469520,-45154296,493288224,-5892938688,
 75085701600,-1017515316480,14668694264704,
 -223340767219392,3570533188036992,
 -59698808359690112,1038791996385239040]