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A106731 as a simple table

na(n)
00
1-2
2-8
3-28
4-96
5-328
6-1120
7-3824
8-13056
9-44576
10-152192
11-519616
12-1774080
13-6057088
14-20680192
15-70606592
16-241065984
17-823050752
18-2810071040
19-9594182656
20-32756588544
21-111837988864
22-381838778368
23-1303679135744
24-4451038986240
25-15196797673472

[0,-2,-8,-28,-96,-328,-1120,-3824,-13056,-44576,
 -152192,-519616,-1774080,-6057088,-20680192,
 -70606592,-241065984,-823050752,-2810071040,
 -9594182656,-32756588544,-111837988864,
 -381838778368,-1303679135744,-4451038986240,
 -15196797673472]