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A291646 as a simple table

na(n)
11
20
3-1
4-1
52
66
7-1
8-29
9-32
10108
11311
12-185
13-1991
14-1590
159468
1622163
17-26645
18-170511
19-70359
20955734
211755790
22-3561052
23-16020532
24309754
25102695477
26141637053
27-463468990
28-1567907433
29806541136
3011367276801
3110768399120
32-59447130815
33-155142592628
34172852194214
351273466836673

[1,0,-1,-1,2,6,-1,-29,-32,108,311,-185,-1991,
 -1590,9468,22163,-26645,-170511,-70359,955734,
 1755790,-3561052,-16020532,309754,102695477,
 141637053,-463468990,-1567907433,806541136,
 11367276801,10768399120,-59447130815,
 -155142592628,172852194214,1273466836673]