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A003180 as a simple table

n a(n)
0 2
1 4
2 12
3 80
4 3984
5 37333248
6 25626412338274304
7 67516342973185974328175690087661568
8 2871827610052485009904013737758920847669809829897636746529411152822140928 

[2,4,12,80,3984,37333248,25626412338274304,
 67516342973185974328175690087661568,
 28718276100524850099040137377589208476698098298976\
 36746529411152822140928]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)