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A209916 as a simple table

n a(n)
0 0
1 0
2 2
3 26
4 1457
5 1889567
6 470184984575
7 359414999291950792703
8 27008149481218253520093899825086463
9 12768639440249474099578561928613102801011591209543532543 

[0,0,2,26,1457,1889567,470184984575,
 359414999291950792703,
 27008149481218253520093899825086463,
 12768639440249474099578561928613102801011591209543\
 532543]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)