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A346945 as a simple table

na(n)
31
4-6
535
6-235
71834
8-16352
9164044
10-1830630
1122513326
12-302700926
134419167532
14-69637654996
151178377833424
16-21315571470320
17410529985172400
18-8388475139138320
19181270810764205440
20-4130796696683135280
2199008773205008777760
22-2490134250475836315120

[1,-6,35,-235,1834,-16352,164044,-1830630,
 22513326,-302700926,4419167532,-69637654996,
 1178377833424,-21315571470320,410529985172400,
 -8388475139138320,181270810764205440,
 -4130796696683135280,99008773205008777760,
 -2490134250475836315120]