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A203423 as a simple table

na(n)
1-3
224
3-250
43240
5-50421
6917504
7-19131876
8450000000
9-11789738455
10340545503232
11-10752962364222
12368510430439424
13-13623365478515625
14540431955284459520
15-22899384412078526344
161032236014321051140096
17-49323481720063219673451
182490368000000000000000000
19-132484966403310261255807810

[-3,24,-250,3240,-50421,917504,-19131876,
 450000000,-11789738455,340545503232,
 -10752962364222,368510430439424,
 -13623365478515625,540431955284459520,
 -22899384412078526344,1032236014321051140096,
 -49323481720063219673451,
 2490368000000000000000000,
 -132484966403310261255807810]