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A038064 as a simple table

na(n)
13
2-6
38
4-18
548
6-124
7312
8-810
92184
10-5928
1116104
12-44220
13122640
14-341796
15956576
16-2690010
177596480
18-21524412
1961171656
20-174336264
21498111952
22-1426419852
234093181688
24-11767874940
2533891544368
26-97764131640

[3,-6,8,-18,48,-124,312,-810,2184,-5928,16104,
 -44220,122640,-341796,956576,-2690010,7596480,
 -21524412,61171656,-174336264,498111952,
 -1426419852,4093181688,-11767874940,33891544368,
 -97764131640]