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A263878 as a simple table

na(n)
00
1-1
21
3-5
47
5-18
630
7-61
8107
9-199
10351
11-628
121100
13-1929
143349
15-5801
169991
17-17158
1829354
19-50085
2085215
21-144651
22244991
23-414120
24698712
25-1176913
261979305
27-3323981
285574727
29-9337914
3015623286
31-26111053
3243594835
33-72716239
34121181919
35-201779356

[0,-1,1,-5,7,-18,30,-61,107,-199,351,-628,1100,
 -1929,3349,-5801,9991,-17158,29354,-50085,85215,
 -144651,244991,-414120,698712,-1176913,1979305,
 -3323981,5574727,-9337914,15623286,-26111053,
 43594835,-72716239,121181919,-201779356]