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A281588 as a simple table

na(n)
00
11
22
33
44
5-5
6-24
7-98
8-272
9621
104960
1131856
12132672
13-437593
14-4893056
15-42854160
16-237969664
171026405753
1814756156928
19163699919104
201136284574720
21-6054175060941
22-106379840985088
23-1428593836836352
24-11899498670002176
2575477454065058725

[0,1,2,3,4,-5,-24,-98,-272,621,4960,31856,132672,
 -437593,-4893056,-42854160,-237969664,1026405753,
 14756156928,163699919104,1136284574720,
 -6054175060941,-106379840985088,-1428593836836352,
 -11899498670002176,75477454065058725]