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A278577 as a simple table

na(n)
11
2-24
3252
4-1472
54830
6-16744
784480
8-113643
9534612
10-577738
11987136
12-6905934
1310661420
1418643272
15-25499225
16-73279080
17128406630
18-52843168
19-196706304
20-182213314
21308120442
22-17125708
232687348496
24-1696965207
25-1596055698
26-5189203740
276956478662
282699296768
29-15481826884
309791485272

[1,-24,252,-1472,4830,-16744,84480,-113643,534612,
 -577738,987136,-6905934,10661420,18643272,
 -25499225,-73279080,128406630,-52843168,
 -196706304,-182213314,308120442,-17125708,
 2687348496,-1696965207,-1596055698,-5189203740,
 6956478662,2699296768,-15481826884,9791485272]