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A176854 as a simple table

na(n)
01
10
2-2
3-7
4-18
5-37
6-52
710
8412
91865
105740
1112922
1216092
13-29767
14-290264
15-1213217
16-3608342
17-7564363
18-6023704
1938816098
20259037300
21991747431
222756105680
235061761997
24284694486
25-47403203725
26-254747436848

[1,0,-2,-7,-18,-37,-52,10,412,1865,5740,12922,
 16092,-29767,-290264,-1213217,-3608342,-7564363,
 -6023704,38816098,259037300,991747431,2756105680,
 5061761997,284694486,-47403203725,-254747436848]