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A002317 as a simple table

na(n)
02
15
27
3-26
4-265
5-1351
6-5042
7-13775
8-18817
970226
10716035
113650401
1213623482
1337220045
1450843527
15-189750626
16-1934726305
17-9863382151
18-36810643322
19-100568547815
20-137379191137
21512706121226
225227629760075
2326650854921601

[2,5,7,-26,-265,-1351,-5042,-13775,-18817,70226,
 716035,3650401,13623482,37220045,50843527,
 -189750626,-1934726305,-9863382151,-36810643322,
 -100568547815,-137379191137,512706121226,
 5227629760075,26650854921601]