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A002615 as a simple table

na(n)
119
2-145
3100
42191
5-8598
614516
7-29080
8114575
9-320417
10615666
11-1125492
122139700
13-3664750
145997448
15-10103304
1615992719
17-23857290
1836059435
19-53341900
2075622578
21-105762592
22145414140
23-198974280
24271923764
25-359683403
26468557626

[19,-145,100,2191,-8598,14516,-29080,114575,
 -320417,615666,-1125492,2139700,-3664750,5997448,
 -10103304,15992719,-23857290,36059435,-53341900,
 75622578,-105762592,145414140,-198974280,
 271923764,-359683403,468557626]