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A135019 as a simple table

na(n)
00
11
2-3
35
4-12
525
6-54
7116
8-249
9535
10-1149
112468
12-5301
1311386
14-24456
1552529
16-112827
17242341
18-520524
191118033
20-2401422
215158012
22-11078889
2323796335
24-51112125
25109783684
26-235804269
27506483762
28-1087875984
292336647777

[0,1,-3,5,-12,25,-54,116,-249,535,-1149,2468,
 -5301,11386,-24456,52529,-112827,242341,-520524,
 1118033,-2401422,5158012,-11078889,23796335,
 -51112125,109783684,-235804269,506483762,
 -1087875984,2336647777]