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A321561 as a simple table

na(n)
11
2-33
3244
4-993
53126
6-8052
716808
8-31713
959293
10-103158
11161052
12-242292
13371294
14-554664
15762744
16-1014753
171419858
18-1956669
192476100
20-3104118
214101152
22-5314716
236436344
24-7737972
259768751
26-12252702
2714408200
28-16690344
2920511150

[1,-33,244,-993,3126,-8052,16808,-31713,59293,
 -103158,161052,-242292,371294,-554664,762744,
 -1014753,1419858,-1956669,2476100,-3104118,
 4101152,-5314716,6436344,-7737972,9768751,
 -12252702,14408200,-16690344,20511150]