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A011526 as a simple table

na(n)
1-1307674368000
24339163001600
3-6165817614720
45056995703824
5-2706813345600
61009672107080
7-272803210680
854631129553
9-8207628000
10928095740
11-78558480
124899622
13-218400
146580
15-120
161

[-1307674368000,4339163001600,-6165817614720,
 5056995703824,-2706813345600,1009672107080,
 -272803210680,54631129553,-8207628000,928095740,
 -78558480,4899622,-218400,6580,-120,1]