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A218296 as a simple table

n a(n)
0 1
1 1
2 4
3 30
4 352
5 5560
6 109056
7 2540720
8 68401152
9 2087897472
10 71236526080
11 2686375597312
12 110951893303296
13 4980913763830784
14 241491517062512640
15 12575483733378816000
16 700015678015053758464
17 41480146826887546372096
18 2606901492484549499682816

[1,1,4,30,352,5560,109056,2540720,68401152,
 2087897472,71236526080,2686375597312,
 110951893303296,4980913763830784,
 241491517062512640,12575483733378816000,
 700015678015053758464,41480146826887546372096,
 2606901492484549499682816]

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Last modified March 2 06:08 EST 2024. Contains 370460 sequences. (Running on oeis4.)