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A351218 as a simple table

na(n)
01
1-1
23
3-16
4121
5-1181
614114
7-199543
83257139
9-60279214
101247164055
11-28525394481
12714681439212
13-19465007759913
14572609747089735
15-18093710202583480
16611202186074834221
17-21979340746682042249
18838330656532184312218
19-33803668628843391999843

[1,-1,3,-16,121,-1181,14114,-199543,3257139,
 -60279214,1247164055,-28525394481,714681439212,
 -19465007759913,572609747089735,
 -18093710202583480,611202186074834221,
 -21979340746682042249,838330656532184312218,
 -33803668628843391999843]