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A247378 as a simple table

na(n)
11
2-2
31
41
5-1
61
72
8-3
9-1
10-11
1117
1246
13217
14-143
152383
1610797
1719054
18497689
192407303
20-18692747
21-184111831
22-1592624618
2326447728169
24396185367129
25-372098609569
26104735294255689
271574163501502418
28-29166210748027547
291549967994300724111

[1,-2,1,1,-1,1,2,-3,-1,-11,17,46,217,-143,2383,
 10797,19054,497689,2407303,-18692747,-184111831,
 -1592624618,26447728169,396185367129,
 -372098609569,104735294255689,1574163501502418,
 -29166210748027547,1549967994300724111]