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A109476 as a simple table

na(n)
01
10
20
3248
42635
515128
6-35216
7-1848840
8-21519084
9-108527528
10824502784
1124266479832
12260841965636
13979414666872
14-16981840179472
15-376923827379432
16-3601671171092868
17-7380259448385800
18346107962132563456
196279421381835120888
2052192589788396122268

[1,0,0,248,2635,15128,-35216,-1848840,-21519084,
 -108527528,824502784,24266479832,260841965636,
 979414666872,-16981840179472,-376923827379432,
 -3601671171092868,-7380259448385800,
 346107962132563456,6279421381835120888,
 52192589788396122268]