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A276908 as a simple table

na(n)
11
20
3-3
40
55
60
7609
80
9-49239
100
1113360325
120
13-15252271827
140
1537424782201065
160
17-170209716095463727
180
191318010670452522053773
200
21-16258330635018856956323115
220
23303578009078402791805745874289
240
25-8239767220259502118041112282583175
260
27314540395737200378455353074387646404949
280
29-16429342682031325194203779796586447506765059
300
311147197863673453312133563419500631514117221228025
320

[1,0,-3,0,5,0,609,0,-49239,0,13360325,0,
 -15252271827,0,37424782201065,0,
 -170209716095463727,0,1318010670452522053773,0,
 -16258330635018856956323115,0,
 303578009078402791805745874289,0,
 -8239767220259502118041112282583175,0,
 314540395737200378455353074387646404949,0,
 -16429342682031325194203779796586447506765059,0,
 1147197863673453312133563419500631514117221228025,
 0]