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A113256 as a simple table

na(n)
0-1
14
2284
38464
4-42256
5322624
64935104
747997184
8-485499136
97142278144
1039980801024
11125848981504
12-2501476028416
1397421005963264
1460463578988544
1516045087719424
1613889461750267904
17942837644226985984
18-3160296751934734336
1918357422585040338944

[-1,4,284,8464,-42256,322624,4935104,47997184,
 -485499136,7142278144,39980801024,125848981504,
 -2501476028416,97421005963264,60463578988544,
 16045087719424,13889461750267904,
 942837644226985984,-3160296751934734336,
 18357422585040338944]