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A321550 as a simple table

na(n)
11
2-2047
3177148
4-4196351
548828126
6-362621956
71977326744
8-8594130943
931381236757
10-99951173922
11285311670612
12-743375186948
131792160394038
14-4047587844968
158649804864648
16-17600780175359
1734271896307634
18-64237391641579
19116490258898220
20-204899955368226
21350279478046112

[1,-2047,177148,-4196351,48828126,-362621956,
 1977326744,-8594130943,31381236757,-99951173922,
 285311670612,-743375186948,1792160394038,
 -4047587844968,8649804864648,-17600780175359,
 34271896307634,-64237391641579,116490258898220,
 -204899955368226,350279478046112]