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A009648 as a simple table

na(n)
00
11
2-3
310
4-44
5255
6-1841
715818
8-156960
91762709
10-22076535
11304867506
12-4600188108
1375280188035
14-1327718893749
1525103478695090
16-506480711742496
1710860420245412873
18-246630317697276235
195912837973247721914

[0,1,-3,10,-44,255,-1841,15818,-156960,1762709,
 -22076535,304867506,-4600188108,75280188035,
 -1327718893749,25103478695090,-506480711742496,
 10860420245412873,-246630317697276235,
 5912837973247721914]