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A321550 as a simple table

n a(n)
1 1
2 -2047
3 177148
4 -4196351
5 48828126
6 -362621956
7 1977326744
8 -8594130943
9 31381236757
10 -99951173922
11 285311670612
12 -743375186948
13 1792160394038
14 -4047587844968
15 8649804864648
16 -17600780175359
17 34271896307634
18 -64237391641579
19 116490258898220
20 -204899955368226
21 350279478046112

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

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Last modified January 17 15:12 EST 2020. Contains 330958 sequences. (Running on oeis4.)