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A291651 as a simple table

na(n)
01
1-1
23
3-7
415
5-26
615
7153
8-1049
94790
10-18522
1164481
12-206181
13606384
14-1615121
153715993
16-6289929
17550850
1861250694
19-382787092
201726745790
21-6691501530
2223413714107
23-75179994017
24221304346963
25-586004040651
261318720868416
27-2044320913276
28-1137686341077
2928530838758784
30-165361803129585

[1,-1,3,-7,15,-26,15,153,-1049,4790,-18522,64481,
 -206181,606384,-1615121,3715993,-6289929,550850,
 61250694,-382787092,1726745790,-6691501530,
 23413714107,-75179994017,221304346963,
 -586004040651,1318720868416,-2044320913276,
 -1137686341077,28530838758784,-165361803129585]