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A259472 as a simple table

na(n)
01
1-2
2-1
3-4
4-19
5-110
6-745
7-5752
8-49775
9-476994
10-5016069
11-57462828
12-712732987
13-9521244982
14-136356161873
15-2084860795232
16-33907076207495
17-584602069590058
18-10652917092110429
19-204604743619641620
20-4131502481607654739
21-87507494737954740126

[1,-2,-1,-4,-19,-110,-745,-5752,-49775,-476994,
 -5016069,-57462828,-712732987,-9521244982,
 -136356161873,-2084860795232,-33907076207495,
 -584602069590058,-10652917092110429,
 -204604743619641620,-4131502481607654739,
 -87507494737954740126]