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A256401 as a simple table

na(n)
01
1-1
20
31
4-1
51
61
7-5
8-8
943
10-74
11-559
12697
13-13232
14-30727
15450991
16-5519014
178250311
1859081053
19-2113948301
2019352683736
21-113555728681
22-4421555920
2310403170713454
244947541575776
25-1037548987977353
264668788227294924
2720521746955820009

[1,-1,0,1,-1,1,1,-5,-8,43,-74,-559,697,-13232,
 -30727,450991,-5519014,8250311,59081053,
 -2113948301,19352683736,-113555728681,-4421555920,
 10403170713454,4947541575776,-1037548987977353,
 4668788227294924,20521746955820009]