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A086456 as a simple table

na(n)
01
1-1
2-2
3-6
4-22
5-90
6-394
7-1806
8-8558
9-41586
10-206098
11-1037718
12-5293446
13-27297738
14-142078746
15-745387038
16-3937603038
17-20927156706
18-111818026018
19-600318853926
20-3236724317174
21-17518619320890
22-95149655201962

[1,-1,-2,-6,-22,-90,-394,-1806,-8558,-41586,
 -206098,-1037718,-5293446,-27297738,-142078746,
 -745387038,-3937603038,-20927156706,-111818026018,
 -600318853926,-3236724317174,-17518619320890,
 -95149655201962]