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A291378 as a simple table

na(n)
11
2-2
34
4-9
524
6-74
7251
8-902
93359
10-12802
1149588
12-194445
13770099
14-3076129
1512380317
16-50162386
17204475572
18-838014584
193451174777
20-14274905490
2159276495017
22-247019567936
231032709501505
24-4330122550717
2518204993223606
26-76728300335664
27324125242867935
28-1372110743864550

[1,-2,4,-9,24,-74,251,-902,3359,-12802,49588,
 -194445,770099,-3076129,12380317,-50162386,
 204475572,-838014584,3451174777,-14274905490,
 59276495017,-247019567936,1032709501505,
 -4330122550717,18204993223606,-76728300335664,
 324125242867935,-1372110743864550]