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A007339 as a simple table

na(n)
01
10
2-6
3-21
4-40
5-5
6504
74697
839808
9362151
103627800
1139915469
12478999872
136227018603
1487178288456
151307674364625
1620922789883904
17355687428091087
186402373705722168
19121645100408825141
202432902008176632000

[1,0,-6,-21,-40,-5,504,4697,39808,362151,3627800,
 39915469,478999872,6227018603,87178288456,
 1307674364625,20922789883904,355687428091087,
 6402373705722168,121645100408825141,
 2432902008176632000]