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A221389 as a simple table

n a(n)
1 0
2 0
3 4
4 94
5 1450
6 20689
7 284702
8 3856027
9 51806212
10 693213401
11 9256626752
12 123474805622
13 1646142914632
14 21939928353674
15 292375085482054
16 3895949812693799
17 51912242778609770
18 691699897071467742 

[0,0,4,94,1450,20689,284702,3856027,51806212,
 693213401,9256626752,123474805622,1646142914632,
 21939928353674,292375085482054,3895949812693799,
 51912242778609770,691699897071467742]

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Last modified May 31 23:52 EDT 2024. Contains 373008 sequences. (Running on oeis4.)