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A321562 as a simple table

na(n)
11
2-65
3730
4-4033
515626
6-47450
7117650
8-257985
9532171
10-1015690
111771562
12-2944090
134826810
14-7647250
1511406980
16-16510913
1724137570
18-34591115
1947045882
20-63019658
2185884500
22-115151530
23148035890
24-188329050
25244156251
26-313742650

[1,-65,730,-4033,15626,-47450,117650,-257985,
 532171,-1015690,1771562,-2944090,4826810,-7647250,
 11406980,-16510913,24137570,-34591115,47045882,
 -63019658,85884500,-115151530,148035890,
 -188329050,244156251,-313742650]