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A156938 as a simple table

n a(n)
0 1
1 2
2 -640
3 -55050240
4 2678771102515200
5 138029104604220676374528000
6 -12755118515091679234002154772496384000000
7 -3319735985081076411622842555075338617937492705280000000000

[1,2,-640,-55050240,2678771102515200,
 138029104604220676374528000,
 -12755118515091679234002154772496384000000,
 -3319735985081076411622842555075338617937492705280\
 000000000]

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Last modified May 27 08:12 EDT 2022. Contains 354096 sequences. (Running on oeis4.)