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A375991 as a simple table

na(n)
01
1-3
20
39
445
5252
61935
719989
8260190
94063887
1073823445
111527002694
1235408499885
13909389617497
1425618701424680
15785355764569749
1626024092206299505
17926859918577582332
1835306305954587340515
191432301360556686816529
2061649353087003554947550

[1,-3,0,9,45,252,1935,19989,260190,4063887,
 73823445,1527002694,35408499885,909389617497,
 25618701424680,785355764569749,26024092206299505,
 926859918577582332,35306305954587340515,
 1432301360556686816529,61649353087003554947550]