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A337676 as a simple table

na(n)
01
1-1
27
3-170
49664
5-1080824
6207876968
7-63709383408
829068641741312
9-18924533538121728
1016870738405288439808
11-20048074289311310521344
1230889296893650981899202560
13-60580966918820974514054369280
14148238116513927185591120536580096

[1,-1,7,-170,9664,-1080824,207876968,-63709383408,
 29068641741312,-18924533538121728,
 16870738405288439808,-20048074289311310521344,
 30889296893650981899202560,
 -60580966918820974514054369280,
 148238116513927185591120536580096]