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A036968 as a simple table

na(n)
11
2-1
30
41
50
6-3
70
817
90
10-155
110
122073
130
14-38227
150
16929569
170
18-28820619
190
201109652905
210
22-51943281731
230
242905151042481
250
26-191329672483963
270
2814655626154768697
290
30-1291885088448017715
310
32129848163681107301953

[1,-1,0,1,0,-3,0,17,0,-155,0,2073,0,-38227,0,
 929569,0,-28820619,0,1109652905,0,-51943281731,0,
 2905151042481,0,-191329672483963,0,
 14655626154768697,0,-1291885088448017715,0,
 129848163681107301953]