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A038068 as a simple table

na(n)
13
2-3
38
4-21
548
6-116
7312
8-831
92184
10-5880
1116104
12-44336
13122640
14-341484
15956576
16-2690841
177596480
18-21522228
1961171656
20-174342144
21498111952
22-1426403748
234093181688
24-11767919276
2533891544368
26-97764009000

[3,-3,8,-21,48,-116,312,-831,2184,-5880,16104,
 -44336,122640,-341484,956576,-2690841,7596480,
 -21522228,61171656,-174342144,498111952,
 -1426403748,4093181688,-11767919276,33891544368,
 -97764009000]