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A349721 as a simple table

na(n)
01
11
2-2
319
4-260
54966
6-121328
73613996
8-127035920
95147600680
10-236245559984
1112112405259560
12-686148484748480
1342560312499982720
14-2868921992458611200
15208828244778853125376
16-16324500711130356582656
171363986660232205656646272

[1,1,-2,19,-260,4966,-121328,3613996,-127035920,
 5147600680,-236245559984,12112405259560,
 -686148484748480,42560312499982720,
 -2868921992458611200,208828244778853125376,
 -16324500711130356582656,
 1363986660232205656646272]