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A331513 as a simple table

na(n)
01
14
2-6
332
4-170
5-228
643764
7-1498880
843826598
9-1249865260
1035978752876
11-1053020066976
1231153402105852
13-914722450924436
1425562930671296360
15-604802562457466880
165868775340572918534
17684246820455046681380
18-78372285809430441261828

[1,4,-6,32,-170,-228,43764,-1498880,43826598,
 -1249865260,35978752876,-1053020066976,
 31153402105852,-914722450924436,25562930671296360,
 -604802562457466880,5868775340572918534,
 684246820455046681380,-78372285809430441261828]