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A010840 as a simple table

na(n)
01
1-40
2740
3-8320
462530
5-322048
61085240
7-1799680
8-2821065
926012480
10-66837420
1135093760
12268749870
13-783902720
14526221400
151691816960
16-3960854625
171042577120
185103133240
19-380798080
20-10159511430

[1,-40,740,-8320,62530,-322048,1085240,-1799680,
 -2821065,26012480,-66837420,35093760,268749870,
 -783902720,526221400,1691816960,-3960854625,
 1042577120,5103133240,-380798080,-10159511430]