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A177776 as a simple table

na(n)
11
21
3-6
480
5-1570
639914
7-1242192
845954240
9-1986728358
1099266274404
11-5684436494176
12370411466138116
13-27283461238591012
142257174498490657648
15-208468812531599092816
1621371789110179099868480

[1,1,-6,80,-1570,39914,-1242192,45954240,
 -1986728358,99266274404,-5684436494176,
 370411466138116,-27283461238591012,
 2257174498490657648,-208468812531599092816,
 21371789110179099868480]