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A213143 as a simple table

na(n)
01
1-4
2-12
3188
42580
5-28324
6-1123212
74593788
8791677140
94687508636
10-789960600012
11-16633684281412
12997739785828500
1346516458962719196
14-1370408093916825612
15-140930266128553137412

[1,-4,-12,188,2580,-28324,-1123212,4593788,
 791677140,4687508636,-789960600012,
 -16633684281412,997739785828500,46516458962719196,
 -1370408093916825612,-140930266128553137412]