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A285195 as a simple table

na(n)
01
10
20
3-1
4-6
5-30
6-142
7-660
8-3054
9-14154
10-65886
11-308442
12-1452940
13-6887508
14-32852082
15-157630609
16-760599954
17-3689418510
18-17984138984
19-88063955880
20-433048404780
21-2137792856760
22-10591472304270
23-52648861274730
24-262514740621860
25-1312653157205088
26-6580914381986160

[1,0,0,-1,-6,-30,-142,-660,-3054,-14154,-65886,
 -308442,-1452940,-6887508,-32852082,-157630609,
 -760599954,-3689418510,-17984138984,-88063955880,
 -433048404780,-2137792856760,-10591472304270,
 -52648861274730,-262514740621860,
 -1312653157205088,-6580914381986160]