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A291614 as a simple table

na(n)
11
21
3-1
42
5-5
613
7-40
8126
9-409
101363
11-4617
1215896
13-55444
14195480
15-695636
162495118
17-9011281
1832741839
19-119601339
20438968354
21-1618006837
225986803522
23-22229028994
2482798248894
25-309299225632
261158483827048
27-4349740078410
2816368842606820
29-61727972554068
30233233590724532
31-882851162632794
323347489178793192
33-12712739206990305

[1,1,-1,2,-5,13,-40,126,-409,1363,-4617,15896,
 -55444,195480,-695636,2495118,-9011281,32741839,
 -119601339,438968354,-1618006837,5986803522,
 -22229028994,82798248894,-309299225632,
 1158483827048,-4349740078410,16368842606820,
 -61727972554068,233233590724532,-882851162632794,
 3347489178793192,-12712739206990305]