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A013310 as a simple table

na(n)
11
22
30
4-12
5-68
6-208
7-56
83472
926272
10119072
11234432
12-1600896
13-22177088
14-159056896
15-769693952
16-1571891456
1716806915328
18276758503424
192610810796032
2018627861722112
2194941413343232
22121510785658880

[1,2,0,-12,-68,-208,-56,3472,26272,119072,234432,
 -1600896,-22177088,-159056896,-769693952,
 -1571891456,16806915328,276758503424,
 2610810796032,18627861722112,94941413343232,
 121510785658880]