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A321545 as a simple table

na(n)
11
2-63
3730
4-4159
515626
6-45990
7117650
8-266303
9532171
10-984438
111771562
12-3036070
134826810
14-7411950
1511406980
16-17043519
1724137570
18-33526773
1947045882
20-64988534
2185884500
22-111608406
23148035890
24-194401190
25244156251
26-304089030
27387952660
28-489306350
29594823322
30-718639740
31887503682

[1,-63,730,-4159,15626,-45990,117650,-266303,
 532171,-984438,1771562,-3036070,4826810,-7411950,
 11406980,-17043519,24137570,-33526773,47045882,
 -64988534,85884500,-111608406,148035890,
 -194401190,244156251,-304089030,387952660,
 -489306350,594823322,-718639740,887503682]